Meaning and name origin
Mortimer \m(o)-rti-mer, mor-timer\ as a boy's name is of Old French origin, and the meaning of Mortimer is "dead sea". From "morte mer". Baronial surname that probably referred to a stagnant lake on the family's lands. First used since the 19th century. Entrepreneur Mortimer Zuckerman.
Mortimer is not a popular first name for males but a very popular surname or last name for all people (#5702 out of 88799, Top 6%) (2000 U.S. Census).
Displayed below is the baby name popularity of the name Mortimer for boys. Mortimer reached its highest rank of #611 in the U.S. in 1880-1889. (2014 statistics).