Likely a variant of Welsh Tegan, meaning "fair" or "darling," used as an affectionate personal name.
Teigan is a variant spelling of Tegan, a Welsh name of ancient Celtic origin meaning "darling" or "loved one," derived from the Welsh word "teg," which means "fair," "beautiful," or "lovely." Welsh is one of the oldest continuously spoken languages in the British Isles, and names drawn from its lexicon carry a particular kind of deep-rooted, lyrical quality. The original Tegan appears in Arthurian legend as the handmaiden of Guinevere, a figure associated with loyalty and devotion — giving the name a quiet mythological pedigree.
Tegan became recognized beyond Wales largely through twentieth-century cultural exports, including its use in the long-running British science fiction series "Doctor Who," where the companion Tegan Jovanka — an outspoken Australian flight attendant — appeared in the early 1980s. The character's feisty, independent personality lent the name a certain spirited quality in popular consciousness. In Australia and New Zealand, the name Tegan (and its variant Teigan) became notably popular during the 1980s and 1990s, with the Teigan spelling emerging as parents sought to customize the look of the name while preserving its sound.
The Teigan spelling adds a visual distinctiveness that separates it from the more traditional Welsh form, appealing to parents who want a name that feels both rooted and individualized. In Ireland and Australia particularly, alternate spellings of Celtic names are a long-standing tradition, and Teigan fits comfortably within that practice. Today it occupies a gentle niche — recognizable to most English speakers by sound, occasionally requiring a spelling explanation, but carrying with it the warmth of its Welsh meaning: a child who is, simply and entirely, beloved.