Scots spay

← German spähen (cognate)

← Middle Dutch spien (cognate)

← Middle Dutch spieden (mention)

← English spy (link)

← Middle English spa (inherited)

← Proto-Germanic *spahōną (derived)

← Proto-Germanic *spehōną (mention)

← Old High German spehōn (cognate)

← Proto-Indo-European *speḱ- (derived)

← Dutch spieden (cognate)

← Old Norse spá (derived)