Origin of stirkMiddle English from Old English stierc, akin to Gothic stairo, barren: see sterile
Origin of stirkMiddle English from Old English stīrc ; see stā- in Indo-European roots.
From Middle English stirk, sterke, styrke, from Old English stÄ«rc, stÈ³rc, stÈ³ric, stÄ«orc (“calf, a stirk, a young bullock or a heifer"), from Proto-Germanic *stiurikaz (“bullock"), diminutive of Proto-Germanic *steuraz (“steer"), equivalent to steer +"Ž -ock. Cognate with Middle Low German sterke (“stirk"), Middle Dutch stierick (“stirk"), German Sterk, StÃ¤rke, Stark (“stirk"). More at steer.