Scandinavian form of Isaac.
Biblical namesake: Isaac is the long-awaited son of Abraham and Sarah, known for the story of his near-sacrifice and as a patriarch of the Israelites. (Genesis · Genesis 21, Genesis 22, Genesis 26)
Saintly namesake: Isaac the Syrian was a 7th-century Christian monk and theologian, revered for his spiritual writings and teachings on prayer and asceticism. He is one of several saints named Isaac. (January 28 · 7th century)
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Names related to Isak through nicknames, language, or historical forms.