The benefice of St Merryn was named Vicaria Sancte Marine (the vicarage of St Marina) in 1259. It continued to be listed in church records as a form of Saint Marina until 1477 when it was named Seynt Meryn. There are two churches in France named after a Saint Marina or Marinus: Lanmérin for a male saint and the former Paris church of St Marina on the Île de la Cité. Churches named after a Celtic saint Merin include those in Llanferin, Gwent; Bodferin, Wales; and Plomelin, Brittany. Doble states that by the Middle Ages, the earlier Celtic saint was replaced by Marina of Bithynia.