Leif Biberg Kristensen is correct!
LNAB as a main rule - doesn't count for norwegian names before 1923; even if americans wan't them to. Patronyms count.
Thing is that before 1923 there was no written rules for naming standard in Norway. Sweden and denmark had some. We had naming traditions, similar to icelandic.
A female was given a first name, her given namei, then inherited her fathers first name, added "datter" or "dotter" - this combination was her name. When she married, she kept her own name. Did NOT "adopt" her husbands name as in LNAB naming system
When this is said; since this was traditions and priests very often was danes, germans or swedes, there is many varieties in church records.
A male got his given name, his last name was combined by his fathers first name plus "-søn" (oldest variety) "-sen" (Norway and Denmark for the most). Oldest son also got the farm name in addition to fathers name. Patronym.
If he got or took name of city or place, it was because he moved - and last name could change if he moved again ...
If he moved to a city, he often brought with him the place he was born as last name - and kept it for life - beginning of LNAB system.
Kristoffer, Christoffer, Christopher is the same name with different spelling only. If you search the norwegian "Digitalarkivet" it doesn't matter how you spell them, the datamodel is familiar to the variaties. to 95%.