Probably a variant of Kiana or Sienna, with associations to ancient place names and soft modern elegance.
Kienna is a graceful modern name that most likely derives from Kiana, a name with dual heritage: in Hawaiian tradition, Kiana is understood as a phonetic adaptation of Diana, the Roman goddess of the moon and the hunt, while in Persian tradition, Kian (or Kayān) is a dynastic name meaning "king" or "royal," linked to the ancient Kayanian kings of Iranian mythology. Both streams carry associations of nobility and luminosity — a goddess of the night sky on one hand, a lineage of legendary rulers on the other.
The softened spelling Kienna adds a distinctly feminine -na ending that transforms the name's architecture and gives it a more overtly lyrical quality. Kienna also echoes the Italian place name Sienna (or Siena), the Tuscan city renowned for its medieval beauty and its distinctive warm terracotta palette, which has itself entered the English naming lexicon as a color name. This visual and geographic layer gives Kienna an unexpectedly painterly association — a name that conjures warmth, ochre light, and Renaissance splendor.
In twenty-first-century usage, Kienna occupies the sweet spot of names that feel invented but grounded, fresh without being entirely unfamiliar. It belongs to a generation of names — Sienna, Brienna, Kiara, Kienna — that share an Irish and Italianate musicality and have found enormous resonance in English-speaking naming culture.