Etymology
Originally British dialect (1850s), from spadge (fronted variant of northern dialect spag) + -er. The northern dialect term spag is a derhoticised form of Scots spurg (“sparrow”), from spur (from Old Norse spǫrr (“sparrow”), suffixless cognate of Old English spearwa) + diminutive suffix -ock, with loss of vowel and voicing of -k to -g after r.