Cognomen Lainio (Lainio 
) , all around the world, is a rare family name. The surname Lainio is characteristic of Northern Europe, particularly Finland, where it is quite a rare surname, Estonia, where it is a rare surname, and Sweden. Measured by absolute frequency, it is commonest in Finland, Sweden, and the United States.
| VARIANT | COUNTRY |
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| Lainio | Sweden, Australia, Philippines, Finland, United States |
| jussi lainio FI (b. 1898) |
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jarmo lainio SE (b. 1955) |
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| eino lainio FI (b. 1913) |
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tanja lainio Finnish singer, FI |
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| minna lainio Finnish long-distance runner and middle-distance runner, FI (b. 1968) |
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Mr, Toni, Topi, Emmi, Eija, Ekku, Ulla, Marko, Matti, Merja, Mikko, Sauli, Sixta, Sofia, Kalle, Pirjo, Raila, Roosa, Delia, Gregg, Lasse, Laila, Tomi, Jimi, Juho, Jari, Ms, Al, Mie, Anu, Kia, Dan, Mark, Manu, Matt, Mira, Leila, Mika, Sami, Anne, Chun, Kari, Kati, Paul, Dana, Lora, Jani, Jami, Miko, and James