Cray

Freshwater crayfish; also a variant of Creighton

As a surname-turned-given name, Cray likely derives from the Middle English word for the freshwater crustacean. It may also function as a shortened form of the Scottish and English surname Creighton, meaning 'settlement near the rocks'. In modern usage, it is a rare, single-syllable choice with a nature-inspired or preppy feel.