JeffersonEnglish Means "son of Jeffrey". A famous bearer was American president Thomas Jefferson (1743-1826). Since this surname was sometimes adopted by freed slaves, it is now more common among the African-American population.
JohnsonEnglish Means "son of John". Famous bearers include American presidents Andrew Johnson (1808-1875) and Lyndon B. Johnson (1908-1973).
SmithEnglish Means "metalworker, blacksmith" from Old English smiþ, related to smitan "to smite, to hit". It is the most common surname in most of the English-speaking world. A famous bearer was the Scottish economist Adam Smith (1723-1790).