"Blend of Ron and etta"
The name Ronnetta is commonly a female name from the "English" origin.
Ronnetta is a modern American feminine formation built from Ron, the short form of Ronald (and of Veronica), plus the diminutive suffix -etta, which appears in English feminine names such as Annette and Rosetta. The doubled n follows the spelling of Ronnie. It is a constructed name rather than one inherited from an older language, so it carries no traditional meaning.
The pronunciation of Ronnetta is ruh-NET-uh.