Jukarainen is a definite surname, and the Finnish spelling of Solomon was indeed Salomon. (There's one or possibly two Salamon, zero Salomon, in the war)
I didn't find anyone with the combination Solomon and Jukarainen on the "warpath" site: https://www.sotapolku.fi/henkilot/?etunimet=salomon
One option that I'm sure you've considered is if he's saying "Sotamies Jukarainen" (Private Soldier Jukarainen)