Name RIBA/RIVA in hebrew/yiddish. #names

Menachem Schreiber

My grandmother just passed away and she was called Riva.
On her grandmother's gravestone, it is spelled ריבא.
On her mother's gravestone, her mother's name is written ריווא.
It also has been written ריבה.
Does anyone know what the correct spelling is?
Menachem Schreiber

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