1999, John Kenneth Muir, A Critical History of Doctor Who on Television, page 339:
Janet Fielding's Tegan also says goodbye to Doctor Who in "Resurrection of the Daleks," and her farewell has an abrupt air to it.[…]Tegan simply has a temper tantrum and says she has seen too much violence. She then runs off into a warehouse and disappears.
2007, Christine Jones, Mariard, Volume 1: The Gifting, page 68:
The lad felt most honoured when Tegan called him her best friend.
2007 August, Barry Walters, How To Tell Tegan From Sara, Spin, page 44:
Canadian indie-rock duo Tegan and Sara Quin have spent a lifetime answering the question: "So which one of you is which?"
2011, Catherine Powell, Safeguarding And Child Protection For Nurses, Midwives And Health Visitors, page 126:
Following a restless and difficult day, Tegan, who is 11 weeks old, falls asleep cuddled up with her mother Carys on the sofa.
20th century coinage from Welshtegan(“toy, darling”), or transferred use of the Irish surname Ó Tadhgáin or of the (Irish-derived English) given name Teagan, which is derived from a diminutive of Tadhg.