Well maybe the original Allison was ..... ya never knows...
It's a pretty name.
Maybe all Debras are named after Debra Paget. All Alices after Alice in Wonderland.
But maybe not, too.

SADLY, for me, "Ronald" was a popular name after WWII, and primarily, I don't know why, my mother said she always loved "Ronald Reagan's" name.
My mother wanted to name me "George Lee" initially (!!!!) and my maternal grandfather was hurt I wasn't named after him (Lester Lee). I'm steamed I wasn't named after my paternal grandfather (none of my cousins were, either)...his name was Benjamin.
I'd have LOVED being named Benjamin.