I did a bit of checking on a Russian name site. Y names were very few, so I looked at J names as many European pronunciations of Y ar like J ...but J lead me to I which is often a substitute in Eastern European languages ...
Anyway, here's a guess for the name's root ... Iador (m) -- "violet gift." But read this page ...
http://www.sca.org/heraldry/paul/h-j.html