Greek Meaning: The name Isidore is a Greek baby name. In Greek the meaning of the name Isidore is: Strong Gift.Gift of Isis (this name is Greek, even though Isis is an Egyptian deity). St Isidore of Seville tried to convert Spanish Jews to Christianity during the 7th century.merican Meaning: The name Isidore is an American baby name. In American the meaning of the name Isidore is: Strong Gift. Gift of Isis (this name is Greek, even though Isis is an Egyptian deity).