I never said Golf by itself was a wind, I said Golf was the German form of Gulf. The term "Golf" (or golfe) predated "Gulf"
Gulf: c.1300, from O.Fr. golfe "a gulf, whirlpool," from It. golfo "a gulf, a bay," from L.L. colfos, from Gk. kolpos "bay, gulf," earlier "trough between waves, fold of a garment," originally "bosom," the common notion being "curved shape," from PIE *qwelp- "to vault" (cf. O.E. hwealf, a-hwielfan "to overwhelm"). Latin sinus underwent the same development, being used first for "bosom," later for "gulf." Replaced O.E. sę-earm. Figurative sense of "a wide interval" is from 1557. The Gulf Stream (1775) takes its name from the Gulf of Mexico.
As to the origins of the car's name being the Gulf Stream, it appears in a few different articles about the car. Here's an example.