There are at least five artists/bands called Sina:

1) Sina is a swiss pop singer. She sings mainly in swiss-german with a dialect from Wallis.

2) A Turkish pop singer.

3) An alternative Iranian band.

4) A Slovak singer, now a member of the band Longital.

5) Electronic artist http://soundcloud.com/sinamusic

6) An italian rap hip hop singer from Sardinia. Born Enrico Silanos, started by publishing his first solos in 2019, gaining a lot of attention with his unique lyrics and flow. He moved to Milan the next year and started his career thanks to Island Records. In September 2020, a few months after the end of lockdown, he published his new EP 'My Love Lockdown' in which he added a few featuring, such as fellow artists Mecna and CoCo.
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Artist biography from last.fm