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Bellemere (ベルメール)Bellemere was Nami and Nojiko's adoptive mother, seen in a flashback during the Arlong arc.
Source: One Piece Wikia
A former Marine, Bellemere came across Nojiko and Nami in the ruins of a town in the aftermath of a great battle. She decides to leave the Marines and raise them as her daughters, in order to get away from the death and destruction of Marine life.