The Nancy Wilson thread inspired me to think of artists with the same name. As many know, there is a Nancy Wilson who sings jazz and also the Nancy Wilson of Heart.

For starters there are two drummers named Roger Taylor. One is the drummer for Queen, the other for Duran Duran. Many people thought they were the same guy but they aren't. Speaking of Duran Duran, the bassist is John Taylor and there are several John Taylor who play other music. I found this out years ago when I worked at Borders and someone asked for John Taylor. I thought they meant the guy from Duran Duran (who has recorded solo albums) but they meant another guy.

John Williams and John Williams (also writes music for movies now and then).