Family name Lucaciu (Lucaciu 
) , in all the world, is quite a rare surname. The cognomen Lucaciu is habitual in Aland Islands, where it is quite a common surname, Romania, and Isle of Man, where it is quite a rare surname. Measured by absolute frequency, this name is the most popular in Romania, the United States, and Austria. Very seldom, Lucaciu is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Lucaciu | Romania, Austria, Germany, Spain, United States |
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vasile lucaciu Romanian priest and activist (1852-1922), RO (b. 1852) |
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antonio lucaciu German saxophonist, DE (b. 1987) |
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robert lucaciu German bassist, DE (b. 1988) |
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| tudor lucaciu RO (b. 1969) |
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| constantin mihai lucaciu researcher |
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| alexandra lucaciu researcher |
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| laura-alexandra lucaciu researcher (ORCID 0000-0002-6310-2384), RO |
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| ondine lucaciu researcher (ORCID 0000-0002-0092-8955) |
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Mr, Lisa, Jane, Nick, Nicu, Edit, Vlad, Ioan, Maria, Magda, Geta, Mihai, Alina, Adela, Adina, Aurel, Calin, Paula, Pavel, Peter, Delia, Sorin, Daria, Gabi, Dina, Ms, Ale, Ana, Dan, Teo, Moni, Mina, Mimi, Alex, Doru, Alin, Aura, Kiki, Paul, Radu, Raul, Roxy, Ruth, Dann, Dana, Anca, and David