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no, she was probably raised Roman Catholic.

The name stretches back to the thirteenth century. There are connections with Robert the Bruce. His daughter Matilda married Thomas d’Isaac. They had two daughters - one of whom, Joanna, married John of Lorne and from that line descends the Dukes of Argyll. Joanna is usually called d’Isaac in texts, but she is also referred to as McIsaac on more than one occasion. Some academics claim that Thomas d’Isaac was descended from Somerled, the Scottish-Viking Lord of the Isles.

There are many forms of the name and different pronunciations. My family pronounce the name M’Keesack quite a soft pronunciation. The surnames McKissack and McKessack and McKessock are all really part of the same surname. Basically, this reflects the Anglicising of many Celtic and Gaelic names.

Yeah, her name has escaped anglicisation somewhat, I'd imagine she'd be McKessock by now if her family was still over here in caber-tossing country :P

The guy from Fantastic Four and the Hornblower series has kept his welsh spelling despite Hollywood pushing for him to adopt 'Owen Griffiths'. It's always a blast watching American interviewers tackle his name whilst trying not to sound like they have no teeth.

My last name is Mac Isaac and pronounced
Mac - Eyes- Ick.
And I live in Nova Scotia, right nexxt to PEI. Thats cool xD

Some of My Ancestors were from (17th and 18th Century) Nova Scotia ... now Where can I find a Cute Girl like Martha MacIsaac for Little Old Me ???