Wiggs is derived from Wigg for which the Dictionary of American Family Names has the following origins:
English (southeastern):
1 probably a nickname from Middle English wicga ‘beetle’.
2 metonymic occupational name for a maker of buns or fancy breads baked in rounds and then divided up into wedge-shaped slices, from Middle English wygge, from Middle Dutch wigge ‘wedge(-shaped cake)’.