Are you sure? I know enough Gaelic to know that it is not, and "Tara" is not really used as a name in Gaelic culture as far as I know.And as for the choice of names for people, this is dreadful! Sure, "Tiara" sounds pretty and tiaras themselves are pretty, but this is not meant to be used as a name; it sounds like the wish of low-class parents to see their daughter succeed in life (and, ironically, such plans have backfired because not many people can take an adult with a name like "Tiara" seriously.). How about "Ciara" (KEE-ar-ah) instead? Or "Tatiana" or "Tanya"? Or something classic that will ensure the girl protection from teasing and odd stares.