Ó Labhradha Tréan
Ó LABHRADHA TRÉAN—I—Trin-Lavery, Tryn-Lavery, Trim-lavery, Armstrong; i.e., 'Strong O'Lavery'; sometimes anglicised Armstrong, on the erroneous supposition that it is derived from 'tréan,' strong, and 'lám,' a hand (or arm).
Alphabetical Index to Irish Surnames