What does Tiernan mean?
Tiernan /tier-nan/ [2 sylls.] as a boys' name (also used as girls' name Tiernan) is of Irish and Gaelic origin, and the meaning of Tiernan is "lord".
How popular is Tiernan?
Tiernan is an uncommon first name for males but a very popular last name for all people (#11981 out of 150436, Top 8%). (2000 U.S. Census)
Shown below is the birth name popularity of Tiernan for boys. Tiernan has yet to be recorded in the list so far. (Top 1000 Birth Names Records, 2014)