William Joseph Crawford (born January 28, 1984), better known by his stage name Ya Boy or Rich Rocka, is an American rapper from the Fillmore District, San Francisco. He is a younger cousin of San Francisco rapper San Quinn and also the cousin of San Francisco 49er's wide receiver Stevie Johnson. Crawford graduated from El Camino High School in South San Francisco, California, in 2002. He was formerly signed to both of Akon's labels Konvict Muzik and Kon Live Distribution.