Cognomen Janonis (Janonis 
, Янонис 
) , around the globe, is a rare surname. The surname Janonis is habitual in Lithuania, where it is quite a common surname, Ireland, where it is a rare surname, and Kazakhstan. Not in comparison with a country's population, it is the most numerous in Lithuania, Russia, and the United States. Much less frequently, Janonis is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Janonis | Argentina, Lithuania, Poland, United States, Ireland |
| Янонис | Kazakhstan, Russia, Ukraine, Belarus |
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julius janonis Lithuanian poet, LT (b. 1896) |
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juozas janonis Lithuanian journalist and politician, LT (b. 1934) |
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| antanas janonis botanist (1913-1995), LT (b. 1913) |
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| bronius janonis (b. 1905) |
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| jonas janonis Lithuanian Righteous Among the Nations, LT (b. 1922) |
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| vytautas janonis Lithuanian architect, LT (b. 1948) |
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| osvaldas janonis LT (b. 1948) |
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| juozas janonis LT (b. 1962) |
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| palemonas gintaras janonis LT (b. 1962) |
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| audrius janonis Lithuanian musician, LT (b. 1995) |
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| klaidas janonis Lithuanian association football player, LT (b. 1997) |
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Mr, Marius, Mantas, Andrea, Angela, Kostas, Kelsey, Romina, Robert, Ronald, Darius, Donald, Leonas, Julius, Justas, Juozas, Einius, Hector, Vilius, Marlete, Maureen, Michael, Irene, Edijs, Nancy, Titas, Al, Ed, Mary, Sara, Rose, Glen, Lisa, Judi, Erin, Megan, Saulius, Allan, Betty, Brian, Kathy, Danas, Domas, Grace, Linas, Jonas, Julia, Tomas, Benas, and Arturas