Sacha
It's difficult to be sure about any surname - there was so much confusion, so many unique-case scenarios and individual family variants not to mention misspelling and miscopying in centuries past when illiteracy was widepsread. The German Zacharias origin was but one alternative. The surname could have also evolved from a hypocoristic (endearing pet) form of such first names as Salomon, Samuel, Samson, Sabin, Sandor, Sambor, Sawa, etc.
Let me give you an example. Kowalczyk seems straightforward enough, as overwhelming majority of case sit originated as a patronymic nic to indicate the son of the kowal (blacksmith), But not all. Someone hailing from the village of Kowale would have also been referred to as Kowal. When he fathered a son, Kowalczyk was one of the ways fellow-villagers would have dubbed the offspring.