Per baby name site Nameberry, Onyx is a fairly uncommon name and is typically given to boys. It takes its name from the gemstone which, per Gem Society, has been popularly used for cameos throughout history.
As noted in the book Rock Roles: Facts, Properties, and Lore, the word comes from the Greek word "onux," which means "fingernail." In Greek mythology, the god Eros is said to have clipped the fingernails of the goddess Aphrodite while she was sleeping. Aphrodite's clipped fingernails then fell to the earth, where they were turned into glittering gemstones by the Fates. The Greeks then called these stones onyx.
The book also noted that, in crystal healing, onyx is thought "to help with energy problems within the body" as "the stone is said to be able to banish excess or unwanted energy." It is also believed "to help sooth worries and fears."
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