question about the gentitive case...

[costumier.livejournal.com]

hello to all.

I'm trying to learn the genitive case, and I was wondering how one would write "______ of (foreign name here)." I'm very new to all this, so bear with me...
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**FEMININE Names:
Russian: of Юля = Юли? or Юляи?

Foreign: of Кайли(Kylie) = Кайли-?

**MASCULINE Names:
Russian: of Борис = Борися?
-->"Саша" is a masculine name; and the genitive endings for masculine nouns are "-a" and "-я"; yet "of Саша" is written "Саши", right? Why?

Foreign: of Роберт(Robert) = Роберт-?
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Upfront apology for any mistakes...

THANKS FOR ANY HELP! :-)

Comments

[nicolya.livejournal.com]

Though nobody knows how to decline correctly such foreign names as Клаудиа. Клаудии? Клаудиы? That's quite a problem:-))

[moon-aka-sun.livejournal.com]

Клаудии. No problem at all.

[nicolya.livejournal.com]

Nevertheless, "Клаудии" - this is from Клаудия, not Клаудиа:-) In fact, in Russian there's no rules for declining such names.