If the Kanji is unknown, you may utilize a Kanji dictionary to search for its pronunciation. (Kanji can be categorized by certain common elements called "radicals" and by how many strokes are in the character.) Once the pronunciation is known, you can simply convert it to roman characters.
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Well, Romaji is the Japanese language converted into a Romanized alphabet. Therefore we still need to translate from English into Japanese using an online translator (although they're not reliable for more than one word translations) or copying Japanese text from somewhere. You can then simply paste the text whether it be in kanji (Chinese characters) or hiragana (Japanese characters) onto a site such as http://romaji.org/ and it will convert it into the roman alphabet.
This website has lots of names in Japanese Kanji symbols.
They seem to offer free translation too.