An English surname meaning “son of Jeffrey.” So either you’re going to have to find a Jeffrey to procreate with, or your little Jefferson’s dad is going to have to change his name to Jeffrey. Just kidding, nobody’s going to care, you rule-breaker you.
Famous people named Jefferson:
U.S. Senator and 84th Attorney General, Jefferson "Jeff" Sessions; President of the Confederate States of America, Jefferson Davis; former U.S. President William Jefferson Clinton; actors Jefferson Mays and Jefferson Bryan Davis.
Perhaps your little Jefferson will be a fan of classic rock and sport a vintage Jefferson Airplane band shirt.