Shannon

Shannon is pronounced and spelled Kanona in Hawaiian.
I learned in a linguistics class a long time ago that this is because there is no "sh" sound in Hawaiian ("k" is the closest sound) and syllables do not end in consonants so the vowel "a" has to be added to the end.
I learned the spelling of the name when a friend brought a keychain with both "Shannon" and "Kanona" on it back from Hawaii.

In Hawaiian, all hard consonants are converted to K, as are all blended consonants, even if they are soft. * That's why Shannon becomes Kanona. Names containing TH will also be assigned a K (e.g. Theodore = Keokolo).

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*WH excepted, since the H is practically silent.