Roman family name that was possibly derived from Latin mane “morning”. Marcus Manlius Capitolinus was a Roman consul who saved Rome from the Gauls in the 4th century BC.
Means “battle king” from Welsh cad “battle” and teyrn “king, monarch”. Cadeyrn (also known as Catigern) was a 5th-century king of Powys in Wales, the son of Vortigern.