There are multiple artists with this name
1. A Canadian alternative rock group
2. A doujin musician
3. An American rapper
4. An Indonesian girl group
5. A South Korean singer, (렌)
Len is an alternative rock group which formed in Toronto, Ontario in 1991 by siblings Marc "The Burger Pimp" Costanzo (vocals, guitar) and Sharon Costanzo (vocals, bass). As a duo they recorded two albums. They eventually brought in 3 additional members, D Rock, DJ Moves and Planet Pea.