Weltha is a girl name. It last appears in U.S. records in 1965. Weltha first appears in 1884 and peaked in 1916 (22 births).
| Year | U.S. births | U.S. + territories | Rank |
|---|---|---|---|
| 1965 | 5 | — | #7,512 |
| 1946 | 7 | — | #4,406 |
| 1945 | 6 | — | #4,541 |
| 1944 | 6 | — | #4,561 |
| 1943 | 6 | — | #4,680 |
| 1942 | 6 | — | #4,612 |
| 1941 | 7 | — | #3,949 |
| 1940 | 8 | — | #3,497 |
| 1936 | 6 | — | #4,165 |
| 1934 | 5 | — | #4,953 |
| 1933 | 8 | — | #3,397 |
| 1932 | 6 | — | #4,397 |
| 1931 | 7 | — | #3,838 |
| 1930 | 11 | — | #2,838 |
| 1929 | 10 | — | #3,130 |
| 1928 | 6 | — | #4,710 |
| 1927 | 11 | — | #3,049 |
| 1926 | 5 | — | #5,593 |
| 1925 | 14 | — | #2,612 |
| 1924 | 10 | — | #3,379 |
| 1923 | 7 | — | #4,364 |
| 1922 | 13 | — | #2,773 |
| 1921 | 14 | — | #2,626 |
| 1920 | 13 | — | #2,726 |
| 1919 | 14 | — | #2,505 |
| 1918 | 10 | — | #3,239 |
| 1917 | 15 | — | #2,307 |
| 1916 | 22 | — | #1,686 |
| 1915 | 17 | — | #1,962 |
| 1913 | 10 | — | #2,154 |
| 1912 | 7 | — | #2,622 |
| 1911 | 9 | — | #1,789 |
| 1909 | 7 | — | #1,952 |
| 1908 | 6 | — | #2,094 |
| 1906 | 5 | — | #2,212 |
| 1905 | 9 | — | #1,418 |
| 1904 | 8 | — | #1,478 |
| 1903 | 6 | — | #1,785 |
| 1901 | 9 | — | #1,223 |
| 1900 | 11 | — | #1,225 |
| 1898 | 5 | — | #1,968 |
| 1897 | 6 | — | #1,544 |
| 1896 | 5 | — | #1,817 |
| 1895 | 5 | — | #1,805 |
| 1893 | 9 | — | #1,089 |
| 1890 | 6 | — | #1,337 |
| 1889 | 6 | — | #1,276 |
| 1887 | 7 | — | #1,032 |
| 1884 | 5 | — | #1,170 |