The Proto-Indo-European word *welhₓ-
Word *welhₓ-
Meaning to be strong
See also Carian: wliat- ‘personal name, strong, powerful’
Synonyms *wal-, *weihₓ-

Comments
Old Welsh gulat, M. Wélsh gwlat 'country, domain', Gaul PN 'Ulatos', Lith. veldu 'posses, rule', Latin valeo 'I am strong', Old Norse valdr 'ruler'.