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Юра, Жора, Гоша, Гога. Юра от Юрий, но Юрий происходит от Георгий. Георгий - Гюргий - Юрий.

So, we rarely call someone Александр, we call him Саша, or Александр Васильевич, for example. He can also be Сашка, Сашок, Сашенька.
My name, Марк, does not have an official short form, but of...

Well, gromozeka explained that there are just short names, which are just a standart way to address people without using the patronymic. It can be impossible to address a teacher in this way for...

that's the safest strategy.

What do you mean?
short names are used most times we use a nime without a patronimic. Their choice is usually limited, some people can prefer to be called in one or another way and introduce...

Some Russian male and female names coincide in the short form. Александр / Александра - Саша, Валентин/Валентина - Валя, Евгений/Евгения - Женя.
Кирилл, как мне кажется, краткого имени не имеет.