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English: variant of Forster ‘worker in a forest’. English: perhaps a nickname from Middle English foster ‘foster parent’ (Old English fōstre a derivative of fōstrian ‘to nourish or rear’). But other explanations are equally or more likely. English: from Old French forcetier ‘maker of scissors’; see Forster English: variant of Fewster from Anglo-Norman French Middle English fu(y)ster ‘maker of saddletrees’ (compare Foister ). Probably an Americanized form of one or more similar (like-sounding) Jewish surnames such as Forster .
Source: Dictionary of American Family Names 2nd edition, 2022