Some clarification on given names:
Viktor = Victor
Teodore = probably called Fiodor or Fedor by family
Katyryna = equivalent to Katherine. Family might have called her Kaska or Kathya, a nickname,
Nastasia = probably baptized Anastazia. Family might have called her Nastia.
Helen = Olena or Elena. Might have been called Lena by family.
Ivan = equivalent to John in English
Marya
Matviy, not Matwig = equivalent to Matthew in English.
Vasil(ij) = equivalent to Basil in English.
Gregorij
Andrej = equivalent to Andrew in English.
Tykhon = Tykhon (old fashioned given name, as per Orthodox Calendar)
Ollana = probably Olena
Montria??? = most likely some version of Matrona ???
Marya