Mercia is a very rare girls' name that was most common in the 1910s and has all but disappeared.
Mercia is a girl name. It last appears in U.S. records in 2016. Mercia was first reported in SSA data in 1918 and peaked in 1919 (9 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 2016 | 5 | 5 | #17,979 |
| 2005 | 5 | 5 | #18,264 |
| 2003 | 6 | 6 | #15,129 |
| 1972 | 5 | — | #9,113 |
| 1967 | 5 | — | #7,488 |
| 1957 | 5 | — | #6,729 |
| 1956 | 6 | — | #5,741 |
| 1951 | 6 | — | #5,227 |
| 1948 | 6 | — | #5,068 |
| 1944 | 5 | — | #5,044 |
| 1943 | 7 | — | #4,072 |
| 1936 | 6 | — | #4,008 |
| 1934 | 6 | — | #4,139 |
| 1933 | 6 | — | #4,062 |
| 1924 | 7 | — | #4,308 |
| 1922 | 7 | — | #4,307 |
| 1921 | 6 | — | #4,895 |
| 1919 | 9 | — | #3,380 |
| 1918 | 6 | — | #4,643 |