Cognomen Irazusta (Irazusta 
) , all over the world, is quite a rare last name. The last name Irazusta is habitual in Latin America and the Caribbean, particularly Paraguay, where it is quite a rare surname, Argentina, and Uruguay. Measured by absolute frequency, it most frequently occurs in Argentina, Paraguay, and Spain. Much less frequently, Irazusta is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Irazusta | Paraguay, Argentina, France, Spain, Uruguay |
| miguel de irazusta Spanish architect (1665-1743), ES (b. 1665) |
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| juan de irazusta Spanish writer, ES (b. 1688) |
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julio irazusta Argentine politician (1899-1982), AR (b. 1899) |
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| rodolfo irazusta Argentine politician, AR (b. 1897) |
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| juan jose irazusta Spanish writer (1901-2001), ES (b. 1901) |
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| juan luis irazusta Spanish association football player, ES (b. 1948) |
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| laurent irazusta French rower, FR (b. 1950) |
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| tito irazusta ES (b. 1955) |
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| jon irazusta researcher |
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| miren irazusta researcher |
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| verónica patricia irazusta researcher |
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| nagore tolosa irazusta researcher |
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| javier irazusta Argentinian rugby union player, AR (b. 1983) |
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Mã, Jose, Josu, Juli, Juan, Nora, Noel, Elsa, Emma, Hugo, Irma, Ilda, Ivan, Iker, Iera, Olga, Omar, Unai, Maria, Marie, Mario, Marta, Lía, Luis, Lara, Dora, Mª, Ana, Ati, Paz, Pio, Gab, Lan, Lia, Lã, Jon, Marga, Eze, Iva, Mari, Mary, Alex, Alma, Abel, Caro, Belu, Rosa, Rita, Hã, and Marã