Family name Lacu (Lacu 
) , around the globe, is a rare surname. The surname Lacu is habitual in Italy, where it is a rare surname, Belgium, where it is a very rare surname, and France. Measured by absolute frequency, it is the most numerous in Italy, France, and Argentina. Much less frequently, Lacu is the forename as well as the last name.
| wilhelm de lacu (b. 1400) |
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| alexander a lacu CH (b. 1550) |
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| philadelphus de novo lacu (b. 1672) |
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| robertus de lacu professor of canon law |
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