The baby name Mortimer appears in baby name data for the United States from 1910 to 1943. It was most popular in 1916 with 69 babies given the name.
In the later years of this period, Mortimer has become less common than it once was.
| Year | Count |
|---|---|
| 1910 | 7 |
| 1911 | 12 |
| 1912 | 38 |
| 1913 | 43 |
| 1914 | 67 |
| 1915 | 48 |
| 1916 | 69 |
| 1917 | 48 |
| 1918 | 60 |
| 1919 | 65 |
| 1920 | 48 |
| 1921 | 61 |
| 1922 | 60 |
| 1923 | 49 |
| 1924 | 35 |
| 1925 | 37 |
| 1926 | 31 |
| 1927 | 25 |
| 1928 | 23 |
| 1929 | 21 |
| 1930 | 17 |
| 1931 | 6 |
| 1932 | 10 |
| 1933 | 9 |
| 1934 | 7 |
| 1936 | 7 |
| 1938 | 5 |
| 1943 | 5 |