The baby name Rilla appears in baby name data for the United States from 1911 to 1937. It was most popular in 1916 with 32 babies given the name.
Over the period shown, Rilla has stayed at a similar level of popularity.
| Year | Count |
|---|---|
| 1911 | 5 |
| 1914 | 25 |
| 1915 | 13 |
| 1916 | 32 |
| 1917 | 10 |
| 1918 | 6 |
| 1919 | 6 |
| 1920 | 25 |
| 1921 | 10 |
| 1922 | 10 |
| 1923 | 5 |
| 1924 | 15 |
| 1925 | 22 |
| 1926 | 15 |
| 1927 | 26 |
| 1928 | 5 |
| 1929 | 26 |
| 1932 | 18 |
| 1935 | 6 |
| 1936 | 15 |
| 1937 | 18 |