Uran is the "borrow word" for uranium in Japanese. The Japanese often use words from other languages when they don't have a word in their language to describe something, thus they "borrow the word" and make it their own! Chitan is the "borrow word" for titanium. The hyphen in the word is there to denote that the last syllable when pronounced is held a little longer. In the case of Ti-tan his name is a play on the fact that he has a loud wail, so it should be pronounced CheeeTan. (In English Tietan or Ti-tan.)
I did post "SCENES FROM THE LOST MANGA "TI-TAN" in a previous thread under that title. The story has never been reprinted in Japanese in full any where as far as I know and I believe it was the last Astro Boy story published in the "Mighty Atom Club" magazine back in 1966.
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