A Debate That Spans the Country, Finally Put to Rest.
Suffer in confusion no more — we've got the answer right here. According to the LaCroix site, the correct pronunciation is "la-croy," as in, rhymes with "enjoy." And yes, "LaCroixs over boys" is supposed to rhyme, too.
The name is essentially a geographic hybrid. The "La" comes from La Crosse, the Wisconsin city where it began, and the "Croix" comes the St. Croix River, which flows between Wisconsin and Minnesota.