My supervisor was also commenting that "Aldridge" sounded very American upper class - "The Aldridges of Boston" or something like that. He thought it might have been a Mayflower name, but after a quick Google search, I can't find any evidence of that.
However, Aldridge is a town in England, which Matt and I visited while we were over there. We were hoping to get a photo of the newest Aldridge in front of a nice "Welcome to Aldridge" sign, but we couldn't find one. We asked at a shop, and apparently touched on a sore point - the shop keeper was just reading over the minutes of a council meeting about trying to get such a sign!
Interestingly, Aldridge is in Walsall, which is where my grandfather was from. So, in becoming an Aldridge by marriage, I've really just returned to my roots!
Update: I think my supervisor was confusing "Aldridge" with "Alden" - John Alden was a character in a poem called The Courtship of Miles Standish. He mentioned this story, and the possibility that there was a John Aldridge involved, but sadly it was John Alden.
