'strap' originates from Old Norse or Middle Low German, specifically the Old Norse word 'stropp' or Middle Low German 'stroppe', where the root meant 'loop' or 'thong'.

'strap' changed from Old Norse 'stropp' and Middle Low German 'stroppe' into Middle English forms such as 'strop'/'strap' and eventually became the modern English word 'strap'.

Initially it meant 'a loop or thong', but over time it evolved into its current meaning of 'a narrow strip of leather, fabric, or other material used for fastening or carrying'.