The Greek Κυριακός (Kyriakos) means "belonging to the lord".
The Latin Dominicus (whence Dominic) has the same meaning and may originate as a translation of the Greek name.
[1] The reduced form Cyricus gave rise to the Latin spelling Quiricus.
Other derived names include Cyrianus, Cyricius and Cyrillus (whence Cyril).
Many Latin spelling variants are known: Quiriacus, Quiracus, Curiacus, etc.