Isadore

Isadore is a masculine given name, an English variant of Isidore. It derives from the Greek name Isidoros, traditionally interpreted as meaning “gift of Isis” or “gift of the goddess Isis.” The spelling Isadore reflects English transliteration and historical usage, and it appears alongside other variants such as Isidor and Izidor.

The name has several related forms, including Isidore, Isidor, and Isidoros. It gained traction in Christian Europe through Latinized forms of Saint Isidore (Isidorus), and English-speaking populations adopted various spellings over time. Today Isadore is relatively uncommon as a given name and is more often encountered in older records or as a family name.

Notable bearers include Isadore Singer (1924–2020), an American mathematician who contributed to the Atiyah–Singer index theorem; he and Michael Atiyah were awarded the Abel Prize in 2004 for their work. The name Isadore is part of the broader Isidore naming tradition, which has appeared in religious, scholarly, and cultural contexts throughout history. While Isadore as a standalone given name is less common today, its variants remain recognized in name etymology and historical records.