...passport? Do I need to sign up again?
Yes, the registration will be valid. If you change your place of residence, you need to make a new certificate of your place of residence accordingly.
If the surname has changed, the following documents must be replaced within a month:
passport of a citizen of Ukraine;
passport for traveling abroad;
taxpayer registration card (RNOKPP);
driver's license;
In addition to the above list, there are a number of documents that also need to be amended if they are available:
data in the voter register
medical cards and insurance policy
car registration and insurance
bank contracts, cards and accounts
will and registration documents of the entrepreneur
Documents that DO NOT need to be changed after changing the surname:
occupational license
documents about education
documents establishing the right to property