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Family name Moulder (Moulder
, Молдер
, מולדר
) , all around the world, is quite a rare cognomen. The cognomen Moulder is habitual in New Zealand, where it is quite a rare surname, the United Kingdom, where it is a rare surname, and Australia. Measured by absolute frequency, it is commonest in the United States, the United Kingdom, and South Africa. Much less frequently, Moulder is the forename as well as the last name.