'baldie' originates from English, specifically the adjective 'bald' combined with the diminutive/informal suffix '-ie' (or '-y'), used to form nicknames or informal nouns.

'bald' developed in earlier English (Middle English and Old English) to describe hairlessness; the familiar suffix '-ie' (from northern English/Scots diminutive and colloquial formations) was later attached to produce nicknames like 'baldie'.

The root 'bald' has long been used to denote hairlessness; over time the form 'baldie' emerged as an informal or affectionate (and sometimes insulting) noun meaning 'a bald person'.