Just set up a new message board under name POZNIAKOV. This seems to be the spelling most in line with the Russian version of this surname. Alternate spellings I have found in researching this family line are Pozdniakov, Posniakov, pozniiakov, pozniiekov, and others. The base name seems to be POZNIAK, with the ending -OFF or -OV indicating "the son of" POZNIAK; if it were a daughter, possibly the ending -OVNA (the daughter of) being spelled POZNIAKOVA or POZNIAKOVNA.