Dictionary of Medieval Names
from European Sources

Llywarch m. Lugus, the name of a Celtic deity, deriving from Proto-Celtic *lug, of disputed meaning, + Old Welsh, Old Breton march 'stallion, steed'.

The name of a 6th C Brythonic prince and a 9th C king of Dyfed.

Wales
Latin
1452 Llowargh (nom) ArchCambIII p. 71; 1454 Llowargh (nom) ibid. p. 72; 1455 Llowargh (nom) ibid. p. 258
Cite as: S.L. Uckelman. "Llywarch". In S.L. Uckelman, ed. The Dictionary of Medieval Names from European Sources, Edition 2019, no. 1. http://dmnes.org/2019/1/name/Llywarch.