Lady Carlyle

I need opinions on names and suggestions for more. Can you help me?

I am writing a book for myself and a play for a script writing class and I find myself in need of some names, and opinion on names I’ve already chosen. Here goes. I have a Scottish character in my book who is in need of a last name, and I don’t know if his first name of Edgar is Scottish or not. I have an English knight in my play who needs a full name, and his lady Alyson needs a last name. The knight was going to be “Sir Bennett Grayham” but I wasn’t quite sure if it fit. I also need an opinion of the name Alexander Applebaum. The character lives in America in the late 1800′s, his mother is French while his father is American. Lastly, please give me your opinion of these names:

Edgar doesn’t sound much like a Scottish name. You could try Elliot or Evan? As for last names, anything with a Mc or Mac in front of it always sounds like a UK-er. Sit Bennett Grayham sounds great to me. And Alexander Applebaum does, too. I like the last name Carlyle.

Royal Albert Lady Carlyle bone china spotted in Dorian Gray movie