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.

Glynn (from Irish: an Gleann, meaning "the valley") is a small village in the Larne Borough Council area of County Antrim, Northern Ireland. It lies a short distance south of Larne, on the shore of Larne Lough. Glynn had a population of 641 people in the 2001 Census.

The Church of Gluaire is supposed to have been founded by St Patrick in 435 A.D. The ruins of an old stone church still stand within the village boundary. Prior to baronial division, the county of Antrim was divided into the districts of North Clandeboye and Glynns (Glynnes). The area was a vicarage in the Diocese of Connor and ecclesiastical province of Armagh and was a gift of the Marquis of Donegal.

The village is then mentioned in a grant from King James I to Arthur Lord Chichester, Baron of Belfast, of his estates in Antrim, Down and Carrickfergus. This grant was dated 20 November 1620. In a later grant from King Charles II to Edward, Viscount Chichester, Glynn was mentioned as being part of the territory of Magheramorne.

Glynn Llywelyn Isaac (November 19, 1937 – October 5, 1985) was a South African archaeologist who specialised in the very early prehistory of Africa. He has been called the most influential africanist of the last half century, and his papers on human movement and behavior are still cited in studies a quarter of a century later.

He took his first degree from the University of Cape Town in 1958 before studying for his PhD at Peterhouse, Cambridge which he completed in 1969. He was also Warden for Prehistoric Sites in Kenya between 1961 and 1962 and Deputy Director of the Centre for Prehistory and Palaeontology at the National Museums of Kenya from 1963 to 1965. Working with Richard Leakey, he was co-director of the East African Koobi Fora project.

In 1966 he joined the anthropology department at the University of California, Berkeley and in 1983 he was appointed Professor of Anthropology at Harvard University where he was developing new research projects at the time of his death. He was survived by his twin brother, Rhys Isaac - an historian, based at La Trobe University.