I've seen in several places that this can also be a feminine form of Keir instead of a spelling variant of Ciara or Kira.Has anyone heard of this? What do you think about this theory?Keir Keira
While being simple and plausible this theory needs some supporting data or a reputable quotation for the Notes: section. Sufficient proof would be a Kiera whose father, grandfather or other close male relative is named Keir.