So I came across this article that seems to indicate that Glenn Frey was actually Glenn Cedar. His mother had a previous marriage to Robert George Cedar and apparently they split up shortly after his birth but somewhere before he was three years old, which is when she married Edward Frey.
https://ethnicelebs.com/glenn-frey
I still haven't tried to determine how accurate this claim is, but I'd like to make sure our profiles are as accurate as possible. At the moment, I've got Edward as father for Glenn, so any input would be welcome. If we can find the records that show his birth as a Cedar, it would make this easier to prove.