Total babies named Mercia (all years): 114
| Year | Girls (count / rank / %) |
|---|---|
| 2016 | 5 / #17974 / 0.000% |
| 2005 | 5 / #18261 / 0.000% |
| 2003 | 6 / #15129 / 0.000% |
| 1972 | 5 / #9113 / 0.000% |
| 1967 | 5 / #7487 / 0.000% |
| 1957 | 5 / #6729 / 0.000% |
| 1956 | 6 / #5741 / 0.000% |
| 1951 | 6 / #5228 / 0.000% |
| 1948 | 6 / #5068 / 0.000% |
| 1944 | 5 / #5044 / 0.000% |
| Year | Girls (count / rank / %) |
|---|---|
| 1943 | 7 / #4072 / 0.001% |
| 1936 | 6 / #4008 / 0.001% |
| 1934 | 6 / #4139 / 0.001% |
| 1933 | 6 / #4062 / 0.001% |
| 1924 | 7 / #4308 / 0.001% |
| 1922 | 7 / #4306 / 0.001% |
| 1921 | 6 / #4895 / 0.000% |
| 1919 | 9 / #3380 / 0.001% |
| 1918 | 6 / #4643 / 0.001% |