no
"Sir." He was knighted.
If you meant 'last name,' then it is Newton. Sir is a title - like Mr. and Isaac is his first name.
Isaac Newton had no middle name
Sir Isaac Newton had no other name.
Sir Isaac Newton studied the nature of things.
two of them were robert hooke and isaac barrow
The Newton Meter
English
Albert Einstein
1665 September
His Nationality is English.