Teighan, a feminine given name phonetically transcribed as /ˈti.ɡən/ (TEE-guhn), constitutes an orthographic variant of the Irish Teagan, itself tracing to the Old Irish Tadhgán—a diminutive of Tadhg, denoting “poet” or “philosopher”—and has been assimilated into Anglo-American onomastic practice for its concise phonological structure and semantic depth. A technical analysis of United States Social Security Administration data between 2005 and 2024 evidences annual registrations ranging from a minimum of five (2005, rank 941st) to a maximum of twenty-seven (2017, rank 932nd), with an ancillary apex in rank at 929th accompanying eighteen registrations in 2021; in 2024, seven newborn females bore the name, positioning it at 943rd in the national hierarchy. This trend line illustrates Teighan’s sustained, niche prevalence and its calibrated orthographic simplicity within contemporary Anglo-American contexts.