Is the name of a friend of mine. I think that's a great one.
You'll do well to find a three-syllable name ending in a vowel, I think.
Kathleen AlessaKathleen Deirdre (which isn't three syllables, but it's nice)
Kathleen FiorellaKathleen MirandaKathleen Lucia
Sorry--can't think of many Irish names at the moment.
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