Teagan, a form of the Irish men's name Teague, is becoming a feminine favorite in the U.S. on the model of Megan and Reagan. Unlike those names Teagan is almost always pronounced with a long "E," giving it a particularly bright and modern sound. In the U.K. you're more likely to encounter Tegan, an unrelated Welsh name.

From The Baby Name Wizard by Laura Wattenberg. Buy the book