Some of these あなた may または may not already know, and I'm not going to include all the vocaloids, but hope あなた enjoy 読書 this anyway. I might add もっと見る to this as time goes on, but don't hold me to it >.>
Hatsune Miku: The first sound from the future
Kagami : Mirror (Mirror image, Rin and Len can be considered mirror 画像 of each other, as 発言しました によって the company) ne:Sound Rin: R for Right (like on Headphones) Len: L（デスノート） for Left
Mergurine Luka: Sound that goes around (because she sings in both English and Japanese)
Prima: from the term "Prima Donna"
Sonika: Hindu name for "Golden" (she wears a yellow...