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As for your questions.
As we understand it, as long as you have been active within the last 2 expansions, characters on the account should be safe from having their names released. However, I’ve made some clarification requests and will update this thread as soon as I get a response.
You need to have had an active account. Inactive/Starter Edition accounts don’t qualify. I have inquired if characters 1-20, assuming they have been active, retain their name.
No, you don’t need to own any of the expansions. As long as you have a base standard edition, that has been active in the last two expansions, you should be good.
I am looking into getting some specifics on if you just need to just have game time, or you need to log into a single character during that time, or you need to log into any character you want to reserve the name on. As soon as I get details back I’ll update this thread.