[Neomi]

Definitely Spoilers...
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I think the first mention of the name "Sarevok" occurs in some of the letters you pick up along the way, but not until after you reach Baldur's Gate (if I recall correctly). Until then, it was just the "Iron Throne" that you were chasing after.

Then, you meet up with a suspicious character by the name of "Koveras" (read backwards) when you return to Candlekeep, which might start to raise some suspicions.

When you return to Baldur's Gate as an accused murderer you get some clues that Sarevok is going to become one of the Grand Dukes. Most players will probably by now guess that Sarevok was the "Armored Figure" but I don't think you really find out until you confront him, either at the Ducal palace or in the last battle.

Hope this helps.