I believe Isorun is correct that Slasher is always two-handed. In fact, I don't remember there being even a SINGLE one-handed axe in . I could be wrong, of course.
There are a few one-handed axes in Divine Divinity, yet not as many as two-handed ones.
All weapon(and item) stats are generated randomly when you mouse over an item(or press alt), so should you find a new weapon you can save before you look at it stats, and try reloading a couple of times, you never know what you're gonna get. Don't spend too much time loading and reloading though, you'll come across better weapons and equipment eventually.