What does Kiernan mean?
Kiernan /kier-nan/ [2 sylls.] as a name for boys means "black". Kiernan is an alternate form of Kieran (Irish, Gaelic). Compare surname Kirnon.
Kiernan has 1 variant: Kernan.more]
How popular is Kiernan?
Kiernan is an unusual given name for males but a very prominent last name for all people (#5614 out of 150436, Top 4%). (2000 U.S. Census)
Below is a charted analysis of the popularity of the boy name Kiernan and related names. Popular related forms of Kiernan (outside Top 1000) appearing in the Top 1000 are Kieran (#576 last year), Kieron and Ciaran. Adoption of these boy names reached its highest in 2011 (usage of 0.1753%) and is almost as widespread today (usage 0.1413%, 19.4% less). Kieran (#576) is the most fashionable baby name in this compilation. (2014 Birth Statistics)