What is "e-sir"

Issah Mmari Wangui (May 20, 1981 – March 16, 2003), better known by his stage name E-Sir, was a Kenyan hip hop artist. He was the elder brother to fellow Kenyan rapper Habib. He was famous for his deft lyrical ability and command of the Swahili language. The phenomenal popularity of his music disproved the myth that Kenyan music could never compete with imported pop. Even long after his death, he is still widely regarded as one of the best rappers to emerge on the Kenyan hip hop scene.