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Oh, OK Friendy, I'll be just a defender :)

Yes, they came from the Greek root "alex". Александр means "defender of people" and Алексей means "defender"(source: Лев Успенский "Ты и твоё имя")[/quote]
I still doubt it for some reason, maybe...

Ну если Лёха кажется вам грубым, то тогда уж Лёша. Алёша это детский сад какой-то.

I don't think so.

No, Алексей and Александр are two different names.
Алексей means 'defender' from Greek.