Surname Firmiano (Firmiano 
) , worldwide, is quite a rare family name. The family name Firmiano is habitual in Brazil, where it is quite a rare surname, Italy, where it is a very rare surname, and the United States, where it is an extremely rare surname. Very seldom, Firmiano is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Firmiano | Italy, France, Brazil, United States |
| iohannes de firmiano author (13th century) (b. 1201) |
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| firmiano pochini (b. 1630) |
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firmiano de morais pinto Brazilian politician, BR (b. 1861) |
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| firmiano antônio de araújo Brazilian politician, BR (b. 1817) |
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| tainah c firmiano researcher (ORCID 0000-0002-0278-6057) |
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Mr, Caio, Caua, Bely, Beth, Braz, Kaio, Kaua, Kaue, Kele, Raul, Rosa, Rose, Roni, Rita, Rise, Ruth, Rute, Ruan, Ryan, Davi, Geni, Ayla, Aiky, Agno, Anna, Ms, Max, Mã, Sã, Ana, Ari, Leo, Lea, Eni, Eva, Gean, Vã, Ian, Yan, Mara, Sara, Sadi, Seni, Alex, Alif, Alan, Aldo, Isa, and Geam