"Variant of Marcella"
The name Marce is commonly a unisex name from the "Latin" origin.
Marce is best explained as a shortened form of names built on the Latin root Marcus, in particular Marcel and its feminine counterparts Marcella and Marcelle. In Spanish it also serves as a familiar short form of Marcela and Marcelo, which fits the name's recorded use for either sex in United States birth data.
Marcella means "Warrior, Warlike one, of Mars. A feminine form of Mark.".
The pronunciation of Marce is MAR-see.