Chastin is of English origin, derived from the Middle English word 'chaste', which means pure or innocent. It was originally used as a nickname for someone who was considered chaste or virtuous. The name gained popularity in the United States during the mid-20th century and has since become a unisex given name. In recent years, it has been more commonly used for males than females.
"While Chastin has seen periods of popularity with spikes in births between 1982 and 1997, it has been less common since then, with only a few occurrences from 2006 to 2014."