Amelia (Penny's daughter)

Not named, but we know he moved to Hawaii with his wife.

Most likely somebody we've never met.

Just enough back story so that we (and Mav) knew Penny was no longer with the dad.

Admiral Benjamin referenced in the first Top Gun...

Penny is first referenced when Maverick and LTJG Nick "Goose" Bradshaw are getting chewed out by CDR Tom "Stinger" Jardian (after the LT Bill "Cougar" Cortell incident), who indicates that Maverick has been previously disciplined (twice by Stinger himself) for "a history of high-speed passes over five air control towers and one admiral's daughter!" Goose then whispers Penny Benjamin's name to Maverick as if to remind him of who she was.

Goose also told his wife about the incident, who then repeated it back to Maverick:

"He told me all about the time you went ballistic with Penny Benjamin."
- Carole Bradshaw to Maverick