Meaning
Japanese meaning: "one by one". English associtations with gorilla speaking sign language (communicating across boundaries).
Japanese "koko" means "here" as well.
Trademark
Several live trademarks, but no apparent conflicts at USPTO.
URL's
koko.com and koko.org are taken. koko.net is for sale.
Icons
If a specific Japanese meaning is chosen, simple or complicated kanji can be used.
[AsbjornUlsberg] Here are several examples of Japanese signs that can be used for Koko-icons:
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http://linear.mv.com/cgi-bin/j-e/nocolor/jap/%b2%d5%b2%d5?TR (means:"individual, separate")
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http://linear.mv.com/cgi-bin/j-e/nocolor/jap/%b8%c4%a1%b9?TR (means:"individual, one by one")
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http://linear.mv.com/cgi-bin/j-e/nocolor/jap/%b8%c4%b8%c4?TR (means:"individual, one by one")
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http://linear.mv.com/cgi-bin/j-e/nocolor/jap/%b8%cd%a1%b9?TR (means:"every house")
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http://linear.mv.com/cgi-bin/j-e/nocolor/jap/%b8%cd%b8%cd?TR (means:"every house")
Discussion
These are Japanese words which starts with koko. Kokoni is a good alternative, imho.
How about "kodama"? Kodama means "echo", and its original meaning is "tree sprite".
[ScottReynen]: These are different names, and I think they should be discussed somewhere else.