Stirk is too small to be worthy of having a Governor. The Mayor reports back to the Count / Countess of Anvil.
I don't like mayor too much because it gives me mental image of fat bloke in suit and cylinder hat standing by a sheriff on a porch in front of some saloon.
Now that I think about it, governor probably reminds folks from U.S. as a head of state. I haven't thought of that.
But Caldera in Morrowind has an Imperial Governor, right?
I just think that Governor, Potentate, Warden, High Commander, Lord, Warden, ..., or some more 'cool' historical rank, function or title would fit better into the setting.