I Don't Know If This Is Common Knowledge, But All Of Team Mustang's Codenames Are Borrowed From Girls

I don't know if this is common knowledge, but all of team Mustang's codenames are borrowed from girls working at Madame Christmas' bar.

This is Vanessa, the girl whose name was assigned to Falman.

That means there's an actual Elizabeth — with whom Roy would talk to over the phone, and go on "dates" with — who is not Riza. That's exactly what makes the codenames effective. At any point Roy can just go on that fishing trip with the real Elizabeth to throw off anyone suspicious.

Also, all the selected girls' names share one or more of the Japanese syllables (kana character) with the person they have been assigned to:

Name (Japanese spelling)

Riza (ri-za) = Elizabeth (e-ri-za-be-su)

Jean (jya-n) = Jacqueline (jya-ku-ri-i-n)

Breda (bu-re-da) = Braidykins (bu-re-i-di-ki-n-su)

Vato (va-to) = Vanessa (va-ne-s-sa)

Kain (ke-i-n) = Kate (ke-i-to)

Poor Breda is the only one whose codename is related to his last name instead of his first name.