I think, at least in my native dialect, that if a syllable is unstressed, most vowels make a sort of schwa sound. Thus Elissa/Alyssa/Ilyssa all sound the same as do
Amelia and
Emilia. This comes out in a lot of more modern names that have spellings in the top 7000 like Amari/Imari/Emari, Amani/Emani/Imani, Aliyah/Elliyah/Illiyah etc.
Al and Ell,
Alice &
Ellis,
Amber & Ember sound different because you're stressing the A/E.
But what do I know, I recently got bitched out by a
Kerry because I pronounced her name like
Carrie, which sounds exactly the same to me!
Where I'm from we also say "bury","berry" and "
Barry" the same, but "
Don" and "
Dawn" are totally different. Go figure.