Well, I'll weed things out based on a very petty standard: what the initials spell.
Catherine,
Marie,
Sophie,
Lena And
Serenity are all axed, ACOP, AMOP, ASOP and ALOP are not what I'd want for initials.
Alyssa Kaitlyn could work although it's close to ACOP,
Alyssa Gabrielle, although AGOP isn't great, I know GOP is a political thing in the States.
Alyssa Natalie could work too although ANOP isn't ideal.
Alyssa Hannah with AHOP would be all right.
Alyssa Anastasia Odette might be my pick, it's sugary sweet but AAOP doesn't make me think of any words, and I prefer
Anastasia because the AL-AL repeated sounds of
Alyssa Alexandra rub me the wrong way.
I guess my top picks would be
Alyssa Anastasia,
Alyssa Hannah, then
Alyssa Natalie.