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Origin of the name "Tito"

As the Communist Party was outlawed in Yugoslavia starting on 30 December 1920, Josip Broz took on many assumed names during his activity within the Party, including "Rudi", "Walter", and "Tito". Broz himself explains:

It was a rule in the Party in those times not to use one's real name, in order to reduce the chances of exposure. For instance, if someone working with me was arrested, and flogged into revealing my real name, the police would easily trace me. But the police never knew the real person hiding behind an assumed name, such as I had in the Party. Naturally, even the assumed names often had to be changed. Even before going to prison, I had taken the name of Gligorijević, and of Zagorac, meaning the 'man from Zagorje'. I even signed a few newspaper articles with the second.Now I had to take a new name. I adopted first the name of Rudi, but another comrade had the same name and so I was obliged to change it, adopting the name Tito. I hardly ever used Tito at first; I assumed it exclusively in 1938, when I began to sign articles with it. Why did I take this name 'Tito' and has it special significance? I took it as I would have any other, because it occurred to me at the moment. Apart from that, this name is quite frequent in my native district. The best-known Zagorje writer of the late eighteenth century was called Tito Brezovački; his witty comedies are still given in the Croatian theatre after more than a hundred years. The father of Ksaver Šandor Gjalski, one of the greatest Croatian writers, was also called Tito.