The Collaborative International Dictionary of English v.0.48:
Herdman \Herd"man\, Herdsman \Herds"man\, n.; pl. -men. The owner or keeper of a herd or of herds; one employed in tending a herd of cattle. [1913 Webster]WordNet (r) 3.0 (2006):
herdsman n 1: someone who drives a herd [syn: herder, herdsman, drover]