There are several artists using the name "Y":

1) A Powerviolence/Grindcore band from Berlin, Germany.

2) An instrumental math rock trio from Gornja Radgona/Murska Sobota, Slovenia, formed in 2004.

3) Y. Japanese vocalist. Circle: C-CLAYS, K2 SOUND.

4) A Rock band from Melbourne, Australia.

5) EDM/Breakcore Producer from Yokohama, Japan.

6) Y. The main vocalist of K-pop boy group Golden Child.

7) Y is an instrumental math rock trio from Maribor/Gornja Radgona/Murska Sobota, formed in 2004. Today, the band consists of guitarist Marko Borko, bass player Andrej Glažar and drummer Bojan Varga. Y plays with ambiental atmospheric soundscapes and sharply contrasted tempos. Traces of hardcore, post rock, math rock and sludge metal can be heard in their precise compositions that prefer crescendos to peaks. Their first EP Germ (2006) was released by the local independent record label God Bless This Mess. Their first full-length album Blessing Alarm was released in 2011 by the same record label.
http://yband.bandcamp.com/
www.yband.si
https://www.facebook.com/Yband

8) Y is a black metal - dark ambient project from Greece created in 2015 by Groeg Zfardasi (also member of Martyria, This Is Past, The Crypt of Memories). https://compitum.bandcamp.com/
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Artist biography from last.fm