1. First names six, middle names five. And I'm going for no initial overlap, either, between either FNs and MNs or for the whole set.
Isabel AmiraShaina ChloeBlythe LuciaPhoebe ElenaXanthe FreyaKalyna Helen
2. Combos with 3, 4, 5, 6, 7, and 8 letters
Julia Maxine (5 and 6)
Thalia Rani (6 and 4)
Yael Giovanna (4 and 8)
Violetta Dua (8 and 3)
Zoe Octavia (3 and 7)
Natalia Quinn "
Natasha" (yep, seven letters for the name AND nickname) (7 and 5)
Unused letters: U and W