Rambo's father R. Rambo, does the 'R' stand for..?

Robert Ronald Richard Reginald Rupert Randall Red Roland Ra Raad Raafiq Raaheim Raanan Raashad Rab Rabbi Rabbie Rabee Rabeeh Rabi Rabie Rabih Raby Racardo Race Racel Racer Rachad Racham Rachaman Rachard Rachaud Rachim Rachman Rachmiel Rachum Rad Radborn Radborne Radbourn Radbourne Radburn Radburne Radcliff Radcliffe Radclyffe Radd Raddie Raddy Rade Radee Radell Radey Radford Radfurd Radi Radical Radlea Radlee Radleigh Radley Radly Radmond Radmund Radolphus Rae Raeborn Raeborne Raebourn Raeburn Raechard Raed Raede Raeed Raekwon Raemon Raemond Raemondo Raemonn Raeshad Raf Rafael Rafael / Raphael Rafaele Rafaelle Rafaello Rafaelo Rafal Rafe Rafeal Rafee Rafeeq Rafel Rafello Rafer Raferty Rafeé Rafeé Raff Raffael Raffaele Raffaello Raffaelo Raffarty Raffe Raffeal Raffee Raffel Raffello Raffer Raffertey Rafferty Raffi Raffiel Raffy Rafi Rafic Rafiel Rafik Rafiki Rafiq Rafique Rafo Raghnall Ragnar Ragnor Ragnvald Rahaeim Raham Rahamim Raheam Raheem Raheim Rahiem Rahiim Rahim Rahime Rahium Rahm Rahn Rahsaan Rahul Rai Raibeart Raibeartag Raidan Raiden Raidin Raihan Raimo Raimon Raimond Raimondo Raimonds Raimund Raimundo Rain Rainald Rainar Rainart Rainault Rainer Raines Rainger Rainhard Rainhardt Rainhart Rainhold Rainier Rainn Rainney Rainor Rains Rainy Raishard Raithnait Raj Raja Rajaah Rajaahn Rajae Rajah Rajahe Rajain Rajan Raje Rajeh Rajen Raji Rajin Rajiv Rajmund Rakeem Rakiim Rakim Ralegh Raleigh Ralf Ralph Ralpheal Ralphel Ralphie Ralphy Ralston Ram Ramario Rambo Rame Ramee Rameer Rameir Ramere Rameriz Ramero Ramey Rami Ramie Ramih Ramires Ramirez Ramiro Ramon Ramond Ramonde Ramone Ramonte Ramos Ramsay Ramsee Ramses Ramsey Ramsie Ramsy Ramy Ramzee Ramzey Ramzi Ramzy Ramón Ran Ranald Ranaldo Ranan Ranard Rance Rancher Rand Randahl Randal Randale Randall Randdy Randee Randel Randell Randey Randi Randie Randl Randle Randol Randolf Randolfo Randolph Randolpho Randy Randyll Raneir Ranen Range Ranger Rani Ranier Ranieri Ranjeet Ranjit Ranndy Rannier Ranolph Ranon Ransom Ransome Ranson Ranulph Ranveer Raol Raoul Raphael Raphaello Raphale Raphaél Rapheal Raphel Raphello Raphiel Raquan Ras Rashaad Rashaan Rashad Rashadd Rashade Rashard Rashaud Rashaude Rashawn Rashead Rashed Rasheed Rasheid Rasheyd Rashid Rashidi Rashied Rashieda Rashod Rashoda Rashodd Rashoud Rasmus Rastus Ratcliff Ratcliffe Raul Raulio Raushaid Ravan Ravean Ravee Raveen Ravel Raven Raveon Ravi Ravijot Ravin Ravine Ravinn Ravion Ravon Ravone Ravonn Ravonne Rawle Roop Rawleigh Rawley Rawling Rawlings Rawlins Rawlinson Rawly Rawson Rawylyn Ray Rayaan Rayan Rayaun Rayborn Raybourn Raybourne Rayburn Rayburne Rayce Raycer Raychard Rayden Raydun Raye Rayedon Rayfield Rayford Rayfus Rayhan Raylan Rayman Raymand Raymann Raymen Rayment Raymon Raymond Raymone Raymont Raymun Raymund Raymunde Raymundo Raynal Raynald Raynaldo Raynar Raynard Raynarde Raynee Rayner Raynes Raynier Rayno Raynold Raynor Rayshad Rayshard Rayshaud Rayshawn Rayshod Rayvan Rayvaun Rayvin Rayvn Rayvon Rayvone Rayyan Raãºl Raúl Reaad Reace Read Reade Readford Reading Reagan Reagen Reaghan Reamon Reamonn Rearden Reardin Reardon Rease Reason Reave Reaves Reb Rebel Rebop Recard Rece Red Redd Redden Reddin Redding Redffurd Redford Redman Redmen Redmon Redmond Redmund Reece Reed Reeding Reef Reeg Reegan Reege Reegen Reerdan Reerden Reerdon Rees Reese Reeve Reeves Refugio Reg Regan Regen Reggie Regginald Reggis Reggy Regi Regie Regin Reginal Reginald Reginaldo Reginale Reginalt Reginel Reginold Reginuld Regis Regnauld Regnault Regner Rego Rehaan Rehan Rei Reid Reide Reiding Reigan Reigh Reighan Reign Reiley Reilley Reilly Reily Reima Reimond Reimonde Reimund Reimundo Reinald Reinaldo Reinaldos Reinard Reinart Reiner Reinhard Reinhardt Reinhart Reinhold Reinier Reino Reinold Reinwald Reiny Reis Reise Reiss Rekker Reku Rem Rembrandt Remee Remi Remie Remington Reminton Remmie Remmy Remo Remon Remone Remus Remy Ren Renado Renald Renaldi Renaldo Renan Renard Renardo Renat Renato Renatus Renaud Renauld Renauldo Renault Renay Rene Renke Renn Rennard Renne Rennie Rennold Rennon Renny Reno Renold Renon Renos Renould Rens Renuney Renuny Renz Renzo Renzy Renzzo René René-Charles Reo Reon Rephael Reshad Reshade Reshard Resharrd Reshaud Reshawd Reshead Reshod Reuban Reuben Reubin Reubén Reubén Reuel Reuven Reuvin Reven Revon Rex Rexford Rey Reyansh Reyce Reyd Reyde Reyes Reymon Reymond Reymound Reymund Reynald Reynaldo Reynaldos Reynard Reynardo Reynaud Reynauldo Reyni Reynol Reynold Reynolds Reyse Reyven Reyvon Rhashad Rhashod Rhaven Rheagan Rheed Rheinallt Rhet Rhett Rheuben Rhian Rhidley Rhiley Rhisiart Rhoads Rhobbie Rhodas Rhoderick Rhodes Rhodney Rhodri Rhuben Rhyan Rhyce Rhydderch Rhylee Rhyley Rhyne Rhys Rhyse Rhythm Riad Riah Rian Ric Ricaldo Ricard Ricardo Ricardoe Ricardos Riccardo Riccarrdo Ricci Ricciardo Ricco Rice Rich Richar Richard Richardo Richards Richardsen Richardson Richart Richaud Richer Richerd Richey Richi Richie Richird Richman Richmen Richmon Richmond Richmont Richmound Richo Richshard Richy Rick Rickard Ricke Rickert Rickey Rickie Ricks Ricky Rico Riczi Ridder Riddley Rider Ridge Ridgy Ridlea Ridleigh Ridley Ridly Ridwan Ried Riel Rieley Rielly Riely Riese Riess Rieti Rig Rigby Rigel Rigg Riggan Rigo Rigoberto Rigs Rihardos Rihards Rik Rikard Riki Rikkey Rikki Rikky Riks Riky Rilee Riley Riley-James Rilley Rillie Rily Rilye Rinald Rinaldi Rinaldo Ring Ringo Rinhaldo Rino Rio Riobard Riobart Riocard Riordan Riorden Rip Ripleigh Ripley Riply Ripp Ripply Riqui Risa Rishaad Rishad Rishard Rishi Risto Ristéard Ritch Ritchard Ritcherd Ritchie Ritchy Ritshard Ritsherd Ritter Rittner River Rivers Riviera Rivo Rivor Riyaad Riyad Riyadh Riyaz Riyod Roald Roan Roano Roar Roark Roarke Rob Roban Robars Robb Robbe Robben Robbey Robbi Robbie Robbin Robbins Robbinson Robby Robbyn Robe Roben Rober Robers Roberson Robert Roberte Roberto Roberts Robertson Robeson Robhy Robi Robie Robin Robinet Robinn Robins Robinsen Robinson Robley Robson Robt Roby Robynson Roc Rocca Rocco Roch Roche Rochester Rochus Rocio Rock Rocket Rockey Rockie Rocko Rockwell Rocky Rod Rodas Rodd Rodderick Roddie Roddrick Roddrigues Roddy Roderic Roderich Roderick Roderigo Roderik Roderrick Roderyck Rodge Rodger Rodgrick Rodgy Rodin Rodion Rodman Rodmond Rodnee Rodnei Rodney Rodni Rodnie Rodnne Rodny Rodolf Rodolfo Rodolph Rodolphe Rodrego Rodric Rodrich Rodrick Rodrigo Rodrigquez Rodrigue Rodrigues Rodriguez Rodrik Rodrique Rodriques Rodriquez Rodriquiez Rodryck Rodryk Rody Roel Roeland Roffe Rog Rogan Rogein Rogelio Rogen Roger Rogerick Rogerio Rogers Rogier Rogue Rohan Rohmer Roi Roibeard Roibin Roibín Roice Rojay Rojelio Rojo Roko Rolan Roland Rolando Roldan Roley Rolf Rolfe Rolin Roll Rolla Rolland Rolle Rolli Rollie Rollin Rollins Rollo Rolly Rolo Rolph Rolphe Roma Romain Roman Romann Rapist Romano Romanos Romanus Romany Romar Romario Romarius Romaro Romarrio Rome Romeiro Romel Romele Romell Romello Romelo Romeo Romer Romere Romerio Romeris Romero Romeryo Romey Romie Romman Rommel Rommello Rommie Rommy Romney Romochka Romolo Romone Romono Romulo Romulus Romy Roméo Ron Ronal Ronald Ronaldo Ronaldson Ronan Rondal Rondale Rondall Rondeal Rondel Rondell Rondey Rondie Rondrell Rondy Roneet Ronel Ronell Roney Rongo Roni Ronie Ronin Ronit Ronli Ronn Ronnald Ronnel Ronnell Ronney Ronnie Ronnold Ronny Ronson Rony Ronyell Roody Roone Rooney Roope Roosevelt Roosvelt Roper Roque Roreto Rorey Rori Rorke Rorrie Rorry Rory Rosario Rosco Roscoe Rosendo Rosevelt Rosh Roshad Roshard Ross Rosse Rossell Rossi Rossie Rossy Rostya Roswell Roth Rouben Roul Rourke Rousseau Roussell Rouvin Roux Rowan Rowdy Rowe Rowen Rowl Rowland Rowlando Rowlands Rowlandson Rednig Rowlea Rowlee Rowleigh Rowley Rowly Rowney Rowyn Roxburghe Roxbury Roy Royal Royale Royall Royce Royd Roydan Royden Roye Royell Royston Royz Ruadan Ruadhan Ruadhri Ruadri Ruaidhri Ruaidhrigh Ruaidri Ruairi Ruairidh Ruaraidh Ruaraí Ruari Ruaridh Ruark Ruban Rube Rubean Ruben Rubens Rubert Rubey Rubin Rubino Ruby Rubén Rubén Rubí Ruda Rudbert Rudd Ruddie Ruddy Rude Rudey Rudi Rudie Rudo Rudolf Rudolfo Rudolph Rudolpho Rudy Rudyard Rue Rueban Rueben Ruebin Ruedi Rufe Ruffin Ruffis Ruffus Rufino Rufo Rufous Rufus Rugby Ruggero Ruggiero Rui Ruiseart Rulan Ruland Rule Rulo Rulon Rumo Rumon Runar Rune Runyon Rupert Ruperth Ruperto Rupheo Rupin Rupprecht Ruprecht Rurik Rush Rushford Rushi Rusk Ruskin Russ Russel Russell Russelle Ruste Rusten Rustie Rustin Ruston Rusty Rustyn Rutger Rutherford Ruud Ruvim Ruy Ry Ryan Ryane Rydder Ryder Rye Ryein Ryely Ryen Ryese Ryez Rygar Ryian Ryiann Ryien Ryin Ryk Ryker Rykk Rylan Ryland Rylee Rylen Ryley Rylie Ryne Rynn Ryon Ryse Rysio Ryszard Ryu Ryuan Ryun Ryyan Rãºben Réamann Rémi Rémi Rémy Rónán Rónán Rötger Rüdiger

La religion est fausse, mais vous êtes réel. https://m.youtube.com/watch?v=bpq26sPbC_4

Rutabaga Rambo

The correct answer is Randy. Randy Rambo.

John J would be teased mercilessly at school about it - "hey John J, how's your dad? Is he still really raaaaaaanddy? Har Har!!". Anyways, it was a small town so once he'd finished his schooling the humiliation didn't stop, always the same old comments. John J got so fed up with it, it invariably effected his relationship with Randy Rambo, so much so that he enlisted with the intention of never seeing small town American life nor his father ever again.

Several year later, John J having travelled to visit an old war buddy got the sad news that he has passed on, then arrived in a small town called Hope, an eerily familiar sort of place for young Rambo...

The truth about Marti Pellow
https://youtu.be/C0VOJ0Z3vY0

Rapey.