dutchman
n.a man who comes from the Netherlands. You use this word to talk about someone's nationality.
n.a male native or inhabitant of the Netherlands. Often used to refer to a person of Dutch descent or nationality.
“The Dutchman showed us the best bike paths in Amsterdam.”
“During the international conference, a friendly Dutchman helped translate the technical documents into English.”
“The legendary Flying Dutchman is a ghost ship that is said to be cursed to sail the oceans forever, never able to make port.”
The plural form is 'Dutchmen'.
While 'Dutch man' is grammatically possible, the compound 'Dutchman' is the standard way to refer to a male citizen of the Netherlands.
“Justin Kluivert (£6m) is set to be Bournemouth 's penalty taker but, when the Dutchman is not on the pitch, expect Tavernier to step up.”
From Middle English Ducheman; equivalent to Dutch + -man.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.