Surname Grenga (Grenga 
) , all around the world, is a rare cognomen. The last name Grenga is characteristic of Italy, where it is a rare surname, the United States, where it is a very rare surname, and Malaysia. Measured by absolute frequency, it is the most numerous in Italy, the United States, and Brazil. Much less frequently, Grenga is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Grenga | Brazil, United States, Malaysia, Italy, India |
| helen e. grenga Chemistry professor, US (b. 1938) |
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| j barry grenga American film producer, US (b. 1970) |
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| andrea grenga researcher |
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| lucia grenga researcher |
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Mr, Luca, Lucy, Jane, John, Joan, Jody, Jeff, Juan, Todd, Gino, Troy, Nina, Elio, Enza, Emma, Faye, Maria, Mario, Mirta, Sarah, Tito, Gina, Gian, Gene, Sam, Dom, Lee, Joe, Joy, Jim, Tad, Tom, Tia, Mary, Mark, Sara, Scot, Aldo, Anna, Paul, Pier, Remo, Rino, Rita, Dino, Shana, and Chris