I have a 4 syllable name, and I don't think it's possible to 100% avoid a NN, so I'd suggest picking a NN to offer as an alternative to Alex (which does seem the default NN for Alexander), if you dislike that so much.
If people still call you Alex when you've told them your NN is Sasha, they're just being jerks, and jerks are usually avoidable.
~ song of the week: "Maid of Culmore" Rising Appalachia
This message was edited 1/8/2022, 1:04 PM