Non-PRO Dutch to English Other Linguistics College sports

is this Dutch mr. the same as the English Mr. or an altogether different form of address? or is Mireille perhaps a typical Dutch male given name please? it appears in a notarization executed by one Mireille N. but the apostille in English says it was signed by mr.M.N. [no space after mr.]. I need to translate it into Polish, so gender is important, so I can be sure if Mireille podpisał or podpisała that thing.