Sigurjón Sighvatsson (born 1952), veteran Icelandic film producer and businessman, born in Reykjavík
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Sturla Sighvatsson (1199–1238), Icelandic chieftain active in the armed conflicts in Iceland during the Age of the Sturlungs
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Þórður kakali Sighvatsson (died 1256), Icelandic chieftain who fought in the Icelandic civil war during the Age of the Sturlungs