What does Thady mean?
Thady /tha-dy/ [2 sylls.] as a boys' name is of Aramaic origin, and the name Thady means "heart". Thady is an alternate form, with the suffix -y, of Thaddeus (Aramaic): also possibly derives from Theodorus.
How popular is Thady?
Thady is an uncommonly occurring first name for males. Thady is an equally unusual surname for all people. (2000 U.S. Census)
Prominent variation forms of Thady (outside Top 1000) listed in the Top 1000 are Thaddeus (#732 a year ago), Thad and Tad. Variants like Tadzio are seldom used. These boy names were at the height of their popularity during the years 1970-1979 (usage of 0.421%) and are now significantly less popular (usage 0.0893%, down 78.8%), with the versions Tad, Thad and Thaddeus becoming less stylish. Below is a graphed comparison of the usage of Thady and corresponding names. (2014 Birth Statistics)