Isaac
[ˈaɪzək]Meaning
from Hebrew Yitsḥaq, "he will laugh, he will rejoice"
Background Story
Isaac comes from the Hebrew name יִצְחָק (Yitsḥaq), derived from the verb tsaḥaq, "to laugh". Genesis explains the name by recounting that Abraham laughed when God told him his aged wife Sarah would bear a son, and that Sarah later laughed on overhearing the same prophecy. As an English Christian name it was occasionally used in the Middle Ages, more often among Jews, and became widespread after the Protestant Reformation.
Temperament
Variations
Isaak, Isac

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