Dutch word lok comes from Proto-Indo-European *leug, and later Proto-Germanic *luką (An opening; aperture; hole. Lock. Shutter.)

Detailed word origin of lok

Dictionary entry	Language	Definition
*leug	Proto-Indo-European (ine-pro)
*luką	Proto-Germanic (gem-pro)	An opening; aperture; hole. Lock. Shutter.
*lok	Old Dutch (odt)
loc	Middle Dutch (dum)
lok	Dutch (nld)	Lock of hair. One curl in hair of the head, confer goldilocks.

Words with the same origin as lok