An Irish surname meaning 'son of Oisdealbhach,' often anglicized from the Gaelic Mac Oisdealbhaigh. Notable bearers include comedian Lou Costello and musician Elvis Costello.
From Irish Mac Oisdealbhaigh, meaning 'son of Oisdealbhach,' where Oisdealbhach is an old Irish personal name possibly meaning 'god-like form.' The surname was brought to prominence by the de Angulo-Norman family who settled in Ireland in the 12th century.
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