The Proto-Indo-European word *wéstor-
Word *wéstor-
Meaning herdsman
See also Proto-Indo-European: *wes- ‘graze’
Synonyms *poh₂imén-

Comments
Mallory J.P. and Adams D. (2006)

Other words that might be of interest
*hₐeĝros ‘pasture, field’, *kerdhehₐ- ‘herd, series’, *wrētos ‘herd, flock’, *hₐeĝrehₐ- ‘hunt’, *wélsu- ‘meadow, pasture’