Great tide or son of the sea
Dillin is a rare variant of the Welsh name Dylan. It is derived from the Welsh elements 'dy', meaning great, and 'llanw', meaning tide or flow. In Welsh mythology, Dylan was a sea god, giving the name a strong connection to the ocean.
Fewer than 5 boys were named Dillin in 2025.
US births per 5-year period, 1990–present (SSA data).
