Rilla is an uncommon variant of Riley that peaked in 1914 and has since faded.
Rilla is a girl name. In 2025 it ranked #12,912 for girl births in the United States (and #21,572 across all names), given to 7 babies. Rilla first appears in 1880 and peaked in 1914 (56 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 2025 | 7 | 7 | #12,912 |
| 2024 | 14 | 14 | #7,884 |
| 2023 | 8 | 8 | #11,988 |
| 2022 | 10 | 10 | #10,254 |
| 2021 | 14 | 14 | #7,952 |
| 2020 | 15 | 15 | #7,497 |
| 2019 | 7 | 7 | #13,519 |
| 2018 | 7 | 7 | #13,526 |
| 2017 | 7 | 7 | #13,814 |
| 2016 | 9 | 9 | #11,598 |
| 2015 | 11 | 11 | #10,021 |
| 2013 | 8 | 8 | #12,919 |
| 2012 | 8 | 8 | #13,206 |
| 2010 | 11 | 11 | #10,318 |
| 2008 | 5 | 5 | #19,846 |
| 2006 | 7 | 7 | #14,803 |
| 2003 | 5 | 5 | #17,813 |
| 1994 | 6 | — | #13,040 |
| 1978 | 6 | — | #9,432 |
| 1976 | 5 | — | #10,480 |
| 1974 | 7 | — | #7,479 |
| 1970 | 5 | — | #8,988 |
| 1969 | 7 | — | #6,447 |
| 1968 | 6 | — | #6,829 |
| 1967 | 8 | — | #5,334 |
| 1965 | 8 | — | #5,190 |
| 1964 | 13 | — | #3,839 |
| 1963 | 10 | — | #4,475 |
| 1962 | 6 | — | #6,417 |
| 1961 | 12 | — | #3,959 |
| 1960 | 9 | — | #4,698 |
| 1959 | 11 | — | #3,982 |
| 1958 | 21 | — | #2,560 |
| 1957 | 7 | — | #5,276 |
| 1956 | 15 | — | #3,147 |
| 1955 | 24 | — | #2,266 |
| 1954 | 15 | — | #2,986 |
| 1953 | 22 | — | #2,281 |
| 1952 | 19 | — | #2,486 |
| 1951 | 31 | — | #1,767 |
| 1950 | 10 | — | #3,621 |
| 1949 | 24 | — | #2,003 |
| 1948 | 17 | — | #2,474 |
| 1947 | 30 | — | #1,781 |
| 1946 | 36 | — | #1,477 |
| 1945 | 23 | — | #1,786 |
| 1944 | 27 | — | #1,599 |
| 1943 | 31 | — | #1,518 |
| 1942 | 32 | — | #1,465 |
| 1941 | 31 | — | #1,412 |
| 1940 | 32 | — | #1,340 |
| 1939 | 32 | — | #1,323 |
| 1938 | 30 | — | #1,370 |
| 1937 | 39 | — | #1,159 |
| 1936 | 28 | — | #1,407 |
| 1935 | 27 | — | #1,439 |
| 1934 | 27 | — | #1,435 |
| 1933 | 36 | — | #1,193 |
| 1932 | 39 | — | #1,158 |
| 1931 | 30 | — | #1,371 |
| 1930 | 31 | — | #1,397 |
| 1929 | 40 | — | #1,191 |
| 1928 | 34 | — | #1,334 |
| 1927 | 41 | — | #1,227 |
| 1926 | 22 | — | #1,870 |
| 1925 | 42 | — | #1,208 |
| 1924 | 42 | — | #1,242 |
| 1923 | 39 | — | #1,264 |
| 1922 | 36 | — | #1,337 |
| 1921 | 30 | — | #1,534 |
| 1920 | 53 | — | #1,027 |
| 1919 | 45 | — | #1,100 |
| 1918 | 46 | — | #1,086 |
| 1917 | 43 | — | #1,097 |
| 1916 | 48 | — | #1,003 |
| 1915 | 44 | — | #1,009 |
| 1914 | 56 | — | #776 |
| 1913 | 18 | — | #1,396 |
| 1912 | 25 | — | #1,051 |
| 1911 | 31 | — | #788 |
| 1910 | 25 | — | #875 |
| 1909 | 24 | — | #840 |
| 1908 | 29 | — | #728 |
| 1907 | 21 | — | #832 |
| 1906 | 16 | — | #952 |
| 1905 | 25 | — | #727 |
| 1904 | 27 | — | #678 |
| 1903 | 22 | — | #729 |
| 1902 | 32 | — | #590 |
| 1901 | 30 | — | #575 |
| 1900 | 45 | — | #508 |
| 1899 | 30 | — | #562 |
| 1898 | 35 | — | #541 |
| 1897 | 34 | — | #505 |
| 1896 | 28 | — | #591 |
| 1895 | 40 | — | #463 |
| 1894 | 29 | — | #542 |
| 1893 | 45 | — | #403 |
| 1892 | 38 | — | #440 |
| 1891 | 35 | — | #427 |
| 1890 | 32 | — | #466 |
| 1889 | 27 | — | #485 |
| 1888 | 26 | — | #500 |
| 1887 | 25 | — | #456 |
| 1886 | 31 | — | #392 |
| 1885 | 30 | — | #379 |
| 1884 | 25 | — | #408 |
| 1883 | 23 | — | #393 |
| 1882 | 19 | — | #428 |
| 1881 | 21 | — | #371 |
| 1880 | 17 | — | #417 |