Yitro appears to be an overall positive character in the Torah. At least as much as Noah or Saul, yet I do not know of contemporary (or even ancient) Jews named Yitro. Why is that?
A possible reason why we do not name children Yisro.
Perhaps the reason we do not name Yisro is due to the fact that Yisro decides to return to Midian and ignores Moshe’s plea to remain with the Jewish people and help guide them into the Land of Israel. http://www.torah.org/learning/rabbiwein/5767/yisro.html