The name Isidore is a boy's name of Greek origin meaning "gift of Isis". Isidore and is often added to lists like Unique Baby Boy Names and discussed in our forums with posts like "Rate the Previous Signature!".
From the experts:
Isabel and Isadora are back: could it now be time for a more widespread revival of Isidore? In 2014, both Isidore and Isadore were on the list of fastest-rising names in the US.
A common ancient Greek name belonging to several saints--including Saint Isidore the Ploughman, patron saint of Madrid and the great encyclopedist St. Isidore of Seville, whose work formed the basis of much medieval knowledge--Isidore was adopted by Spanish Jews to the point where it was almost their exclusive property.
In addition to the obvious Izzy, another traditional nickname is Dore/Dory.