What is the name of this Vocaloid? From Hatsune Miku Vocaloids.

Her name is Yowane Haku. She's not actually a Vocaloid she is a derivative character of Hatsune Miku that has been officially recognised.
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Haku

Actually, that's not a vocaloid, it's a fanloid. Haku and Neru are both fanloids, and teto is an UTAU. They're three of the most 인기 fanloids and UTAUs, so they put them in the game as a special part.

Haku is a girl, 의해 the way! ♥︎ She's included in the Project Diva games, too, as 당신 can see, but with the fanmade 보컬로이드 they don't include their voicebanks into the games.