"little rose"
The name Rosella is commonly a female name from the "Italian" origin that means "little rose".
Rosella is an Italian feminine name formed from Rosa with the diminutive suffix -ella, so its literal sense is "little rose." It is an established given name in Italian, and its use in English-speaking countries is recorded in the late nineteenth century.
The pronunciation of Rosella is roh-ZEL-uh.