Mervin is a spelling of Mervyn, the English form of the old Welsh name Merfyn, which was borne by a 9th-century king of Gwynedd. Its meaning is uncertain; it is often explained through the Welsh words for "marrow" and "eminent", and it is easily confused with Marvin and Merlin. In the United States Mervin stood at number 2038 in 2000, reached number 1858 in 2001 and has stayed in the 2300 to 3000 range since 2015; it ranks number 2377 in 2025.