Meaning and name origin
Grantham is not a popular first name for males but a very popular surname or last name for all people (#2446 out of 88799, Top 3%) (2000 U.S. Census).
Displayed below is a comparison of the popularity of the boy name Grantham and its source form. The only popular variation form ranked in the Top 1000/100 is Grant (#155). (2014 statistics).