Selyf ("Solomon"; ) is a Welsh male given name. It may refer to:
Salomon of Cornwall (5th century), a prince of Cornwall and father of Saint Cybi Selyf ap Cynan (called Sarffgadau, "Battle-serpent"), a 7th-century king of Powys killed at the Battle of Chester
See also Solomon, known as Selyf in Welsh Solomon (name)