What does Keller mean?
Keller \k(el)-ler\ as a boys' name is of Old German origin, and the meaning of Keller is "cellar". Probably referred to someone whose cellar was stored with ales or wine. Also possibly (Irish, Gaelic) "dear friend".
Keller is an uncommonly occurring first name for males but a very prominent surname for both adults and children (#321 out of 88799, Top 1%). (2000 U.S. Census)
Charted below is the baby name popularity of Keller for boys. Keller has not been recorded in the list so far. (Top 1000 Birth Names Statistics, 2014)