anyone reading this just as curious as i am where our surname comes from ?
its extremely rare.
— This unsigned comment was added by Paris889 (talk • contribs).
Not an expert but if I had to guess, I'd say it's likely a nickname for a bald or poor person, from the adjective goły. This adjective is probably also the root of the surname Gołaś. There were 1489 people with the surname Gołaś, and 81 with the surname Gołach, living in Poland in the early 1990s:
-ś is one of several different suffixes which may be used to create nicknames (see for example Jaś, a nickname formed from Jan.)
-ch is also sometimes used, though it's not as common in modern Polish. You can find more info about this suffix in the following book, pages 259 to 263