There are multiple artists by this name:

1) Ren Gill, a singer, songwriter, producer, rapper, multi-instrumentalist based in Brighton. Started his career busking. Signed with Sony Records in 2010, but got dropped due to a mysterious illness he developed the same year, eventually diagnosed as Lyme disease. Self-released his debut album Freckled Angels in 2016 with the intention of raising awareness of his illness. Also a member of The Big Push from 2019 to 2022. He has attracted some degree of notoriety for his self-released videos, which are often solo performances filmed in one take; his track "Hi Ren", about his struggles with mental and physical illness, received 5.85 million views on YouTube within two months of its release.

2) Tokyo-born male singer-songwriter ReN (born 28 Feb 1994) whose debut album "Lights" got released in June 2016

3) A 17-year-old (as of February 2020) female Canadian singer-songwriter making her career debut in February 2019 with her single, "Waves"

4) REN is a Japanese Rapper/Singer

5) Arranger, composer, producer, and freelancer, who is also involved in the Touhou doujin music scene, as a member of Higan Daybreak.

6) A South Korean sub-vocalist and maknae in the K-pop group NU'EST, soon to be a soloist
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Artist biography from last.fm