Likely an English elaboration of Sharon, from a Hebrew place name meaning a fertile plain.
Sharrona is likely an English elaboration of Sharon, which comes from a Hebrew place name meaning a fertile plain. That gives the name a natural and biblical background that has long supported its use.
The added ending makes Sharrona feel more expansive and ornate than Sharon, with a more decorative feminine rhythm. It sounds polished and gently formal, while still keeping the place-name warmth of the original. The name is familiar in spirit but individualized in shape.