I suggest you investigate further. Romilly is a French surname derived from a place name whose etymology is uncertain.
According to French Wiki, the name of the town of Romilly-sur-Seine comes from latin Romeliacum, which it may or may not come from the Roman Personal name Romilius.
A similar (actual) French given name is Romélie,
Everly. Constance. Lux. Mary. // Hunter. Maxence. Valentine. Alexis.This message was edited 3/4/2013, 8:30 AM