I find something interesting in their names:
Kohinata >at Jisho.org doesn't give any result, but if we separate the first kanji "ko", and look for "Hinata
" it give us few more words with.
Mangetsu = Full moon
> Shingetsu = New Moon. Just opposite of Mangetsu!
Name (1st?) エルネスタ
Main NAME (?) 深海
> Fukami ... mmm it does not give a big deal. Just some names with use these kanji: https://jisho.org/search/深海%20%23names
Hakamada = nothing interesting ( https://jisho.org/search/袴田%20%23names
Suishō = Noun: (rock) crystal; high purity quartz