Dirk \d(i)-rk\ as a boy's name is pronounced derk. It is of Danish origin. Variant of Derek (Old German) "the people's ruler", and Dietrich. The name is also the Scottish term for a small, sharp knife. See also Dedrick. Flemish painter Dierick Bouts.
Dirk has 4 variant forms: Dierck, Dieric, Dierick and Dirck.
For more information, see also the related name Theodoric.