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Last name origins & meanings:

1. Catalan: occupational name for a maker of crossbows or a soldier armed with a crossbow, from Catalan ballester ‘crossbowman’ or ‘crossbow maker’, an agent derivative of ballesta ‘crossbow’ (Latin ballista ‘(military) catapult’).
2. English and German: occupational name, cognate with 1, from an agent derivative of Middle English, Old French baleste ‘crossbow’.