The names in Gathering Blue are an odd case because in the society where it takes place, your name changes its number of syllables as you age. You start out with a one-syllable name when you're born, so for example, Kira was given the name "Kir" at birth and will have a third syllable added to "Kira" when she becomes an adult. I don't know if that has anything to do with why her name was changed, but it might (I don't know much Spanish, is there any sound that can be added to "Kira" that would make it a weird or bad sounding name?)