I have tried to break into the brothers K two or three times and it’s just been so difficult for some reason. I know it’s kind of a joke at this point, but keeping track of all of the names is just so dizzying and distracting.
E.g. Dima (widely used in modern Russian, and it’s clear that it’s short for Dmitry) instead of Mitenka or Alex instead of Alyosha (Lyosha is commonly used in Russian, but Alex would be easier to make a mental connection... until you have an Alexander and have to shorten that to Sasha; that one is probably a more widely known diminutive though)