I'm just going to do fns because I'm feeling lazy. I hope that's okay.
My current choices (setting aside my top favorite combos for now)
Vance,
Marcel,
Eiran,
Raisel,
Sally and
Fern.
Same letter
Amos,
Alaric,
Andrew,
Astra,
Ariel, and
Aurore
20 most popular
Andrew,
Christopher,
Michael,
Hannah,
Sarah, and
Elizabeth "
Eliza"
Letters in order
Enoch,
Francis,
Gamaliel,
Hermia,
Isadora, and
Juliet
Forms of
JohnIoan,
Jack "
Jocky",
Janis,
Johanna,
Ivana "
Iva", and
Genette