I-sack
His full name was Sir Isaac Newton. Isaac is his first name.
Isaac is his first name. He had no middle name.
Isaac Newton’s stepfather's name was Barnabas Smith.
Isaac's name was not changed; he is consistently referred to as Isaac in the biblical narrative. However, his son Jacob had his name changed to Israel after wrestling with an angel, which is a significant event in the biblical story. Isaac remains a key figure as the son of Abraham and the father of Jacob.
Isaac Newton the Elder, Iaac Newton was named after his father.
iezak
The great violinist Itzhak Perlman is called "Itzy" by some of his friends. Announcers pronounce his name "Itzark".( I think it's the original (Hebrew) version of Isaac.)
Eye-Sack Sing-er
His full name was Sir Isaac Newton. Isaac is his first name.
Hannah Ayscough
Isaac Tigrett's birth name is Isaac Burton Tigrett.
Isaac Lidsky's birth name is Isaac Jared Lidsky.
Isaac Lipscomb's birth name is Isaac Edward Lipscomb.
Isaac Lassiter's birth name is Isaac Thomas Lassiter.
Isaac Escobedo's birth name is Peter Isaac Escobedo.
Isaac Hanson's birth name is Hanson, Clarke Isaac.
Andrew Isaac's birth name is Andrew Evan Isaac.