Flaccus

Flaccus was a ''cognomen'' of the ancient Roman plebeian family Fulvius, considered one of the most illustrious ''gentes'' of the city. Cicero and Pliny the Elder state that the family was originally from Tusculum, and that members still lived there in the 1st century.

As usual for ''cognomina'', "Flaccus" was likely originally a nickname, probably of Marcus Fulvius Flaccus, the founder of the family. The etymology of "Flaccus" is unknown, but it is similar to other adjectives describing deformities of the body, like ''brocc(h)us'' (buck-toothed), ''lippus'' (blear-eyed), etc. It has been variously interpreted as meaning "big ears", "flop ears", "lop-eared", "floppy", or "fatty".

''Flaccus'' was also a ''cognomen'' for a branch of the patrician Valerii and others. Provided by Wikipedia