Quinn comes from the Irish surname O Cuinn, often traced to a root meaning "wisdom" or "counsel" -- originally a family name long before it became a given name. As a unisex choice today, it tends to carry a sense of directness: someone whose judgment is trusted without much ceremony around it.
In summer, when the Sun enters the terms of Mars, heat is caused; in winter, drought, and scarcity of rain and waters. - William Lilly (1602.-1681.)