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They aren't "middle names", but rather "father names". "Son of Whomever". They happen to be said between the first name and surname when all names are spoken, but are not true "middle names".

As for the "son" ending, it is vic/vich/vitz/wicz/wikcz depending on where in the Russian-influenced lands you live.

By the way, the female ending is "anov", I think, as in Anastasia Nicholianov Romanov (Anastasia, Nicholas' daughter, of Rome/A Daughter of Rome)