If it's a variant of Lung Ying, could just be that it is called that because who ever learned it began to teach it in Fukien. That's an origin story I've heard for some branches of Lung Ying.

If it's a completely different system, all I would guess is that it was founded in Fukien and/or is said to come from the Southern Shaolin temple in Fukien.

Fukien is Fujian, btw. If that's what you meant.

I wonder if there's the possibility of it originating from Northern Dragon, and then moving south?