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English: variant of Andrew with genitival or post-medieval excrescent -s. This is the usual southern English patronymic form also found in Wales; the Scottish and northern English form is Anderson . In North America this surname has absorbed various cognates from other languages e.g. Polish Andrzejewski Slovenian Andrejčič Serbian and Croatian Andrić (see Andric ) and Czech Ondráček (see Ondracek ). Irish and Scottish: Anglicized form of Scottish Gaelic Mac Aindreis or Irish Mac Aindriú see McAndrew.

Source: Dictionary of American Family Names 2nd edition, 2022

Includes other variations such as Ander, Anders, Andrus, etc.