A few weeks ago we started using first name variants when detecting duplicates and in search results. See the announcement here. We've been doing this with surnames for a few years.
The name variants we use come from WeRelate's Variant Names Project.
We are planning on updating the first and last name databases quarterly, so if you notice any variants that are missing from WikiTree, enter them at WeRelate and we will import the changes.
If you don't want to create an account at WeRelate, you can also post missing variants here, and I will do it for you.
There are lots of variants on Norwegian first names, and hence also the patronyms, but there are a few regularities:
Norwegian names were written by Danish clergy for hundreds of years, and since abt. 1850 have been "taken back" by Norwegian bygdebok authors and given a more national character by eg. changing the soft Danish consonants into Norwegian hard ones. A name written as "Thyge" in the church records may be rendered as "Tyke" in a bygdebok, which is actually one of the least extreme examples I can think of. A few other examples: Aasold/Åsulf, Svenum/Sveinung, Engel/Ingjald.
Thus, there may often be a wide gap between how a name is spelled the first time you encounter it, depending on whether you've found it in the bygdebook or in the original records. For a non-Norwegian, I think it may be rather challenging.
On a side note: Due to the need for a standardised placement of patronyms, in the Norway Project there's general agreement to put it in the LNAB, and "aquired" family names in the CLN. I've discovered that can be very challenging to find profiles with such an "aquired" surname. A good example is this profile of Tomas Larsen Brønlund. A search for surname "Brønlund" won't find him. Neither does a search for given name "Tomas" and surname "Brønlund". You've got to write his first name exactly as "Thomas". In my opinion, that's hardly optimal. It's pretty much the same situation as when you're looking for royalty on WikiTree; it's far simpler to go to Google and type "site:wikitree.com" + the name you're searching for. WT doesn't really scale in terms of searchability.
Variants for the Slovak surname, attested as Petržala (based on my reading of baptismal records from Skalica earlier this year):
(Note that the surname of descendants living in Binghamton, N.Y. is attested as Petržala: "Dejiny Binghamtonských Slovákov za dobu styridsat rokov, 1879-1919")