Isaac ( /ˈaɪzək/;Hebrew: יִצְחָק, Modern Yitsẖak Tiberian Yiṣḥāq, ISO 259-3 Yiçḥaq, "he will laugh"; Yiddish: יצחק, Yitskhok; Ancient Greek: Ἰσαάκ, Isaak; Latin: Isaac; Arabic: إسحاق‎ or Arabic: إسحٰق‎ʼIsḥāq) as described in the Hebrew Bible, was the only son Abraham had with his wife Sarah, and was the father of Jacob and Esau. Isaac was one of the three patriarchs of the Israelites. According to the Book of Genesis, Abraham was 100 years old when Isaac was born, and Sarah was beyond childbearing years.

Isaac was the only biblical patriarch whose name was not changed, and the only one who did not leave Canaan. Compared to those of Abraham and Jacob, Isaac's story relates fewer incidents of his life. He died when he was 180 years old, making him the longest-lived patriarch.

The anglicized name Isaac is a transliteration of the Hebrew term Yiṣḥāq which literally means "He laughs/will laugh."Ugaritic texts dating from the 13th century BCE refer to the benevolent smile of the Canaanite deity El. Genesis, however, ascribes the laughter to Isaac's parents, Abraham and Sarah, rather than El. According to the biblical narrative, Abraham fell on his face and laughed when Elohim imparted the news of their son's eventual birth. He laughed because Sarah was past the age of childbearing; both she and Abraham were advanced in age. Later, when Sarah overheard three messengers of the Lord renew the promise, she laughed inwardly for the same reason. Sarah denied laughing when Elohim questioned Abraham about it.

Yitzhak "Buji" Herzog (Hebrew: יצחק "בוז'י" הרצוג‎, born 22 September 1960) is an Israeli politician and lawyer. He is currently a member of the Knesset on behalf of the Labor Party, and has previous served as Minister of Welfare & Social Services, Minister of the Diaspora, Society, and the Fight Against Antisemitism, Minister of Housing and Building and Minister of Tourism.

Herzog is the son of Israeli President Chaim Herzog and Aura Herzog, and the grandson of Rabbi Yitzhak HaLevi Herzog. He was born in Tel Aviv and studied law at Tel Aviv University and Cornell University. Herzog is married with three children, and is nicknamed Buji.

Although he did not win a seat in the 1999 elections, Herzog served as government secretary in Ehud Barak's cabinet until 2001 when Barak was defeated by Ariel Sharon in a special election for Prime Minister. In 1999, he was also investigated in the 'Amutot Barak' scandal (a scandal involving allegations that the party funding law was violated), but maintained his silence. The Attorney General, therefore, decided to close the case against him due to lack of evidence. From 2000 until 2003, he served as chairman of the Israel Anti-Drug Authority.