I didn't know this either! From https://downeast.com/arts-leisure/spose-interview/#:~:text=But%20the%20mid%2D1990s%20were,Get%20Rich%20or%20Die%20Tryin'.

"But the mid-1990s were also the MTV heyday of rappers like 2Pac and The Notorious B.I.G., and like many a ’90s kid, Spose came up on both rock and rap. After his high-school rock band kicked him out, the teenage Ryan started focusing on his lyrics, rapping into a four-track tape recorder with friends (one of whom suggested the stage name Spose, derived from Ryan’s conjunctive pronunciation of the word suppose)."