Solomon "Sol" LeWitt, American artist
SolGareth "Garry" Davis, American peace activist, first self-declared "World Citizen," and founder of the World Citizen Foundation and World Government of World Citizens
Sol the evil preacher in Warriors by ErinHunter Roman personification of the Sun. Greek equivalent- Helios Feminine name in Spanish. Borne by one of El Cid's daughters in the Cantar de Mio Cid.
If you're going with the Spanish word for sun, it's pronounced like soul, and it's also a girl's name
Sol, character in ErinHunter's "Warriors" series
SolRama, character in Marvel Universe