Where does “suurkaupunki” come from?

suurkaupunki (Finnish) comes from Finnish kaupunki, from Old Gutnish kaupungr, from Old Norse kaupangr, from Old Norse kaup, from Old Norse kaupa, from Proto-Germanic kaupōną, from Proto-Germanic kaupô, from Latin caupo.

suurkaupunki (Finnish): large city, metropolis

Definitions

large city, metropolis

Ancestry of “suurkaupunki”, step by step

Step	Language	Word	Meaning
1	Finnish	kaupunki	town; city
2	Old Gutnish	kaupungr	marketplace
3	Old Norse	kaupangr	marketplace
4	Old Norse	kaup	purchase
5	Old Norse	kaupa	to buy
6	Proto-Germanic	kaupōną	to buy; trade
7	Proto-Germanic	kaupô	innkeeper; merchant
8	Latin	caupo	Tradesman; Innkeeper, shopkeeper
9	Proto-Indo-European	kaup-	—

Every word from Proto-Indo-European kaup- →Every word from Latin caupo →Every word from Proto-Germanic kaupô →