From Orsay or dark-skinned
As a surname-turned-given name, it likely has two distinct roots. It often functions as a habitational name for someone from Orsay, France, or it may derive from the Irish Gaelic 'Γ Dorchaidhe', meaning descendant of the dark-one.
Less common today
Dorsey isn't in the latest US Top 1000. It last peaked at #3,341 in 1992.
US births per 5-year period, 1990βpresent (SSA data).
Early rockabilly singer and songwriter
NFL Pro Bowl running back
Actor known for the film The Warriors