-ski/-ska, -scy/ski, -wicz - Polish surnames help

I know that if you're a guy you are -ski, a girl you are -ska and if you're married you're -scy/sky

But what rules apply to -ewicz ?

Dziekuje.
x

Normally it does not change.
However, you can say (somewhat old fashioned way) for example
-ewiczowa - when talking about Mrs. -ewicz (wife of Mr -ewicz)
-ewiczówna - when taking about Miss -ewicz (daughter of Mr/Mrs -ewicz)

thank you (:
Google wouldn't give me any answers.

You're welcome

In Poland. In some countries (including USA) they say that there must be one version, so usually both men and women are -ski.

i was told the same as you by the polish tutor at college regarding polish surnames :) but sometimes also the woman can choose whether to be a ski or ska really when she becomes married ....

-scy is plural and used when talking about more than one person with the same lastname
I don't -sky is Polish, maybe Russian or Ukrainian

yeah, I wouldn't use these forms