The Izo- in those names is probably derived from Old Russian изяти (izyati) meaning "to take".
If you want to know how common the name Izot is in this day and age, you could do a search on social media websites such as Facebook, LinkedIn and VKontakte (ВКонтакте). If you end up finding few to no bearers, then the name is most likely archaic.
"How do you pick up the threads of an old life? How do you go on... when in your heart you begin to understand... there is no going back? There are some things that time cannot mend... some hurts that go too deep... that have taken hold." ~ Frodo Baggins