Question

От какого мужского имени очество образуется не совсем таким же образом,как от остальных?

Answer 1

Ян
..................

Answer 2

The Formation of Patronymics in Russian

In the Russian language, patronymics are formed by adding a suffix to the father's first name. This is a common practice and is followed for most male names. However, there is one exception to this rule, where the formation of the patronymic is slightly different compared to others.

The name Ivan is the only male name in Russian that forms its patronymic differently. Instead of adding the usual suffix, the patronymic for the name Ivan is formed by replacing the final "n" with "ovich" or "evich". For example, if the father's name is Ivan, the patronymic would be Ivanovich or Ivanevich.

This unique formation of the patronymic for the name Ivan is an exception to the general rule followed for other male names in Russian.