That's the answer given by Nicole March 26, 2012, but it's a bit of a stretch. On the face of it loushe seems a variant of louche, and is a family name that means "squinting" from Latin lusca/luscus, from the same root as lux "light", the original sense perhaps "squinting or shutting one eye (because of the light)". Minna meaning protective is also a stretch. It's a German abbreviation for Wilhelmina, which just means "Will (thought/desire)" + "helmet", not "protective" with a diminutive/genitive suffix to create a feminine (compare Carolina "of Charles" < Carol "Charles"). All this is purely speculative without a contemporary explanation from the family as to where the name came from.