There have been 7 J.T.s in the history of Major League Baseball. That goes up to 10 if you count players who were occasionally called J.T. as a nickname but went by another name on the lineup card; for our purposes, we won’t count those dilettantes. In the all time two-letter abbreviated name rankings, the 7 true J.T.’s trail the A.J.s (22) and lead the R.J.s (4). There’s a tie with the C.J.s. Of our 7 J.T.s, 4 put periods after the letters, while 3 prefer the stark simplicity of an unpunctuated “JT”. Interestingly enough (or perhaps not so interestingly), all 7 of those J.