Popularity in the United States (by decade)
Numbers
| Theo (masculine) | Theo (feminine) | |||||
| Year | Rank | Percent Used | Rank | Percent Used | ||
| 2020 | #153 | 0.133 | - | - | ||
| 2010 | #377 | 0.041 | - | - | ||
| 2000 | #1161 | 0.007 | - | - | ||
| 1990 | #1599 | 0.003 | - | - | ||
| 1980 | #1323 | 0.003 | - | - | ||
| 1970 | #1420 | 0.002 | - | - | ||
| 1960 | #1387 | 0.002 | - | - | ||
| 1950 | #1254 | 0.002 | - | - | ||
| 1940 | #1031 | 0.003 | #1507 | 0.002 | ||
| 1930 | #749 | 0.006 | #1208 | 0.003 | ||
| 1920 | #644 | 0.009 | #785 | 0.007 | ||
| 1910 | #601 | 0.010 | #705 | 0.009 | ||
| 1900 | #471 | 0.015 | #656 | 0.010 | ||
| 1890 | #592 | 0.010 | #640 | 0.009 | ||
| 1880 | #640 | 0.008 | #603 | 0.009 | ||
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