Llywelyn — Possibly a Welsh form of the old Celtic name Lugubelenus, a combination of the names of the gods Lugus, which means "light", ultimately from the Indo-European root *leuk "light, brightness" and Belenus.
Alternatively it may be derived from Welsh llyw "leader". Llywelyn was the name of several Welsh rulers, notably the 13th-century Llywelyn the Great who fought against England.
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Names related to Llywelyn through nicknames, language, or historical forms.