Cognomen Mercaldo (Mercaldo 
) , all around the world, is a rare surname. The cognomen Mercaldo is habitual in Italy, where it is a rare surname, the United States, where it is a very rare surname, and New Zealand. Measured by absolute frequency, this name is the most popular in Italy, the United States, and Brazil. Much less frequently, Mercaldo is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Mercaldo | Italy, United States, Canada, France, Brazil |
| francesco mercaldo researcher |
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| sarah fletcher mercaldo researcher |
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| noemi mercaldo researcher |
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| sarah mercaldo researcher (ORCID 0000-0001-8519-1982) |
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| nathaniel d mercaldo researcher |
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| luigi mercaldo |
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| rachel mercaldo |
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| valentina mercaldo |
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| maria teresa mercaldo |
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Mr, Dana, Dawn, Gina, Leah, Lisa, Luca, Luke, Jane, Josh, Rita, John, Joao, Joey, Jean, Nick, Elza, Eric, Erin, Hank, Fred, Joan, Pete, Paul, Beth, Ms, Sam, Ann, Kim, Pam, Ron, Lea, Joe, Tom, Vic, Ian, Mary, Mark, Mike, Saul, Alan, Aldo, Anna, Abby, Coby, Cris, Ivan, and Iole