The Spanish verb 'chivar' meaning 'to hunch' comes from an earlier Spanish form 'gibar' with the same meaning. This in turn derives from the Latin word 'gibba' meaning 'hump'. The evolution from Latin 'gibba' to Spanish shows both expected sound changes (the shift from Latin 'bb' to Spanish 'b') and some less common ones (the shift from initial 'g' to 'ch').

A related and more common Spanish word is 'giba', meaning 'hump' or 'bump', which comes from the same Latin root 'gibba'. The word 'giboso' meaning 'hunchbacked' is also related.

While English doesn't have many common words directly related to 'chivar', the medical term 'gibbous' (meaning protuberant or hunched) comes from the same Latin root 'gibba'. You might be familiar with this word from the term 'gibbous moon', which describes the moon when it appears more than half full and has a rounded, hunched appearance.