Meaning and name origin
Decatur \d(e)-ca-tur\ as a boy's name. Surname. There is a process called "decating" in the manufacture of cloth. Deca- in Greek means "ten", but might also mean "pure". Stephen Decatur was an early 19th-century naval hero. There are several American towns named for him.
Decatur is not a popular first name for males but a very popular surname or last name for all people (#29122 out of 88799, Top 33%) (2000 U.S. Census).
Displayed below is the baby name popularity of the name Decatur for boys (2014 statistics).