I know an
Alycia and several
Alicia's. they all pronounce it ah'LEE'sha
I also know an
Alesia and
Alyssa that pronounce theirs ah'LEE'see'uh
Also know an
Alissa and several
Alyssa that say ah'LISS'uh
never met an
Alysia but I think it would be said the same way as the second 2 I've mentioned.