What does Hilal mean?
Hilal is the Arabic word for the new crescent moon that marks the start of a lunar month. Used for both genders (predominantly feminine in Turkey). A literal moon name.
What does Zayn mean?
From Arabic زين (zayn) 'beauty, grace, adornment', from the root z-y-n. Established as a beauty name; often carries a sense of inner as well as outward beauty. Used mainly for boys but also as a unisex form.