Popularity in the United States (by decade)
Numbers
| Lacy (feminine) | Lacy (masculine) | |||||
| Year | Rank | Percent Used | Rank | Percent Used | ||
| 2020 | - | - | - | - | ||
| 2010 | #1638 | 0.007 | - | - | ||
| 2000 | #1040 | 0.012 | - | - | ||
| 1990 | #560 | 0.022 | - | - | ||
| 1980 | #302 | 0.046 | #1991 | 0.002 | ||
| 1970 | #824 | 0.010 | #1390 | 0.002 | ||
| 1960 | - | - | #1010 | 0.003 | ||
| 1950 | - | - | #837 | 0.004 | ||
| 1940 | - | - | #692 | 0.006 | ||
| 1930 | #1966 | 0.002 | #631 | 0.008 | ||
| 1920 | #1746 | 0.002 | #598 | 0.010 | ||
| 1910 | #1277 | 0.003 | #571 | 0.011 | ||
| 1900 | #954 | 0.005 | #446 | 0.017 | ||
| 1890 | #891 | 0.005 | #514 | 0.012 | ||
| 1880 | #1088 | 0.003 | #622 | 0.008 | ||
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