If you can provide more context or the intended meaning, I might be able to help you find the correct French translation.
For example, are you trying to say:
* Mom/Mother: "Maman"
* "Mum" (as in "a mum" for a fruit or flower): "Une mère" (meaning "a mother")
* A specific word that sounds like "mahm" in a different language: Please give me the original word and its meaning.
Let me know!