There are numerous artists with this name, including:
1) Sina is Swiss pop singer Ursula Bellwald (born 28 May 1966 in Visp);
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) Italian rap hip hop singer Enrico Silanos from Sardinia;
7) Sina is German drummer and singer Sina Doering.

1) Sina is Swiss pop singer Ursula Bellwald (born 28 May 1966 in Visp). She sings mainly in Swiss-German with a dialect from Wallis. In 1990, she tried her hand at being a pop singer with German songs under the pseudonym Sina Campell; her name Ursula became Ursina, then Sina.

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.

7) Sina is German drummer and singer Sina Doering.
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Artist biography from last.fm