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The number is under-represented because US English is not used worldwide:

ilovemymum: 7928 ilovemymam: 926

Pa, Pop, Dada, Daddy, Mommy, etc. There's work to be done here, folks!

Mam..?

Mammogram. Radiographic procedure that is painful and potentially life saving.

Northern English

And Northern Irish.

Personally I hear 'ma' more in Northern Ireland, never heard 'mam' (although maybe I am mishearing).

I heard `mammy` on Derry Girls which is supposed to be an Irish show.

Yeah, my Irish family say 'mammy'.

Ah, cool