I don't think flowing justified text into a circle present any more of a spacing challenge than text flowed into a rectangular shape. And for the most part, look relatively spaced. Here are some tips though... create a paragraph style for all, create various character styles for anomolies. Turn off hyphenation for names. If this is first and last name, and you don't want the name to break, apply "no break" to entries. A fixed white space between names may produce better results than a simple space. You will probaly have to tweak tracking, word spacing, kerning method, point size, font scale, etc. to obtain a "perfect" result.