About Vocaloid2 : Luka Megurine

Megurine Luka (巡音ルカ) was the third Japanese Vocaloid2 from Crypton and released on January 30, 2009.^[2] Her surname combines Meguri (巡, circulate or around) and Ne (音, sound), while the name Luka invokes the homonymous Japanese words of "nagare" (流, flow) and "ka" (歌, song) or "ka" (香, scent); thus making "songs to all around the world as scent spreads." Yū Asakawa (浅川 悠) provided the voice for the "cool, somewhat mysterious" character.

From :

http://vocaloid.wikia.com/wiki/Megurine_Luka