What to call the spray of sea water?

Solution 1:

I think it's called "sea spray."

Solution 2:

Are you looking for spindrift ?

Spindrift usually refers to spray, particularly to the spray blown from cresting waves during a gale. This spray, which "drifts" in the direction of the gale, is one of the characteristics of a wind speed of 8 Beaufort and higher at sea. (Wikipedia, "Spindrift")