A user submission cites Rocca as a rare feminine variant of Rocco and though it's logically constructed I was wondering (1) if it was accurate and had some history of usage, and (2) if anyone knew other feminine names of the same origin or accepted feminizations of related male names. I searched for the meaning "hrok" and found nothing else. To relay everything that BtN has about Rocco and is relatives:
Italian form of a Germanic name derived from the element hrok meaning "rest". This was name of a 14th-century saint who nursed victims of the plague but eventually contracted the disease himself. He is the patron saint of the sick.