The name Izaac is a variant spelling of the Hebrew name Isaac, which has its origins in Biblical times. The name Isaac comes from the Hebrew word "yitskhak", meaning "he laughs" or "he rejoices". In the Book of Genesis, Isaac was the son of Abraham and Sarah, and his name was chosen because his parents laughed with joy upon learning of his impending birth.

The name Izaac first gained prominence in the Middle Ages, particularly in regions with significant Jewish populations. It was a common name among Sephardic Jews in Spain and Portugal, as well as Ashkenazi Jews in Central and Eastern Europe. The variant spelling "Izaac" likely arose due to regional linguistic influences or scribal errors in transcribing the name from Hebrew to various European languages.

One of the earliest known historical figures to bear the name Izaac was Izaac ben Judah Abravanel (1437-1508), a prominent Jewish philosopher, commentator, and statesman who served as a finance minister in Portugal and Spain. In the 16th century, Izaac Luria (1534-1572), also known as the "Ari", was a renowned Jewish mystic and leader of the Kabbalistic school in Safed, Palestine.

In the 17th century, Izaac Walton (1593-1683) was an English writer best known for his book "The Compleat Angler", a classic work on the subject of fishing. Around the same time, Izaac Ysraels (1616-1648) was a Dutch Baroque painter known for his portraits and genre scenes.

In the 18th century, Izaac Cordozo (1777-1868) was a prominent Jewish leader and philanthropist who served as the chief rabbi of the British Empire from 1819 to 1868. During the 19th century, Izaac Mauricio Cohen (1808-1895) was a successful businessman and financier in London, known for his philanthropic efforts within the Jewish community.

These are just a few examples of notable individuals who have borne the name Izaac throughout history, showcasing its enduring presence across various cultures and time periods, particularly within the Jewish tradition.