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Surname Tõnu (Tõnu , Тыну ) , around the world, is an extremely rare last name. The cognomen Tõnu is habitual in Northern Europe, particularly Estonia, where it is a rare surname. Much more frequently, Tõnu is the forename as well as the last name.
Aru, Pippar, Raadik, Rääk, Lember, Lehtla, Järve, Talpsep, Valdur, Metsäär, Raudsepp, Rohumägi, Tuppits, Naissoo, Eermann, Schasmin, Akmentin, Pullerits, Grünberg, Tammiksalu, Tammearu, Steinberg, Kastan, Särgava, Ilves, Tramm, Oja, Mets, Sein, Sepp, Kask, Kesa, Kukk, Park, Laur, Laak, Pomerants, Laas, Taal, Vaus, Viik, Ints, Mägi, Anton, Arrak, Kerge, Kõiv, Jää, Tamm, and Trubetsky