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Considering your other quesions, I presume that you're asking the word for "mother", and the spelling should be "mommy", not "mummy". The first two are more westernized answers, and, if you're looking for more Japanese-like ways of saying "mommy", it would be "母ちゃん" (kaa-chan) or "お母ちゃん" (o-kaa-chan). Alternatively, "母さん" (kaasan) or "お母さん" (o-kaasan) will also works fine.