Spelling

Trasop or Trasopp?

Both. The Norwegian Mapping Authority (Kartverket) has approved Trasopp as the name of the residential area, while the school, the sports park and Statistics Norway use Trasop. Both are pronounced the same.

What the registers say

Name	Spelling	Status at Kartverket
The residential area	Trasopp	Approved
Trasoppveien	double p	Official street name (1933)
Trasoppterrassen	double p	Official street name (1944)
Trasopphallen	double p	Approved
Trasoppklinikken	double p	Private name
Trasop skole	single p	Approved
Statistical units (SSB)	single p	Nordre, Søndre and Østre Trasop

Source: the Central Place Name Register and Statistics Norway's basic statistical units, checked October 2026.

Why a double p makes sense

The Oslo city encyclopedia reads the name as «tra opp», an encouragement to walk or drive up the hill. That makes the double p the natural spelling, and it is the one the street names have used since the 1930s.

The single p has still won in everyday use, because it is what the school and the statistics use. This site uses Trasop, and trasopp.no leads here.