m wrote:Was Ivanovich ever alive?
"Ivanovich" is a very common Slavic name (especially in Russia and the Ukraine). It is simply a patronym for "son of Ivan" (in Russian/Ukrainian, most names for sons ending in -in, -yn, -ov, -ev, -vich/-ovich, etc. mean "son of").
It would be very easy to make up such a name and know that it would be virtually impossible for someone to verify your story. For an example, if you said, "I know a John Johnson from Chicago", have fun trying to find him.