The Tocharian B word walo
Word walo
w ɐ l o
IPA wɐlo
Meaning king
See also Phrygian: ΒΑΛΗΝ ‘king’
Old Norse: valdr ‘ruler, mighty one’
Scythian: varkida ‘personal name, princess’

Comments
Douglas Q. Adams, “Etymological Dictionary of Tocharian B”, 1999, Brill

Other words that might be of interest
tāś ‘commander’, perneu ‘glorious’, nay ‘governance’, wayauca ‘leader’, saswe ‘lord’, käṣṣī ‘master’, klyomo ‘noble’, mäñcuṣke ‘prince’, mäñcuṣka ‘princess’, lāntsa ‘queen’, kamartīke ‘ruler’, oṅkipṣe ‘shameless’