The name Tierney is a boy's name of Irish origin meaning "descendant of a lord". Tierney and is often added to lists like Alternatives to Ryan and discussed in our forums with posts like "Baby a Day".
From the experts:
Tierney is a Celtic surname with a definite Irish twinkle, a name just waiting to be discovered. Though now sometimes used for girls (in the US, not Ireland), as in jazz singer Tierney Sutton, it still has plenty of masculine punch.
Tierney, in its original Tiarnach form, was the name of several saints. It can also join the ranks of Old Hollywood names, via the haunting actress Gene Tierney. ER actress Maura Tierney is a current surname bearer.