アフリカーンス語のspoorから、オランダ語のspoor, track, trailから、原ゲルマン語*spur, to kick, to tread, から、PIE*sper, ankle, to treadから、語源はspur, spurnと同じ。
英語の語源
spoor
spoor: see spur
spoor (n.)
"track, trace," 1823, used originally by travelers in South Africa, from Afrikaans spoor, from Dutch spoor, from Middle Dutch spor, cognate with Old English spor "footprint, track, trace," from Proto-Germanic *spur-am, from PIE *spere- "ankle" (see spurn).