Where does “upper-” come from?

upper- (Middle Dutch) comes from Middle Dutch op, from Old Dutch up, from Proto-Germanic upp, from Proto-Germanic ub, from Proto-Indo-European upó, from Proto-Indo-European h₃ewp-.

Ancestry of “upper-”, step by step

upper- traces back through two separate lines of ancestry.

via Middle Dutch op

StepLanguageWordMeaning
1Middle Dutchopon, on top of; at, in the direction of; at, by
2Old Dutchupup, upwards
3Proto-Germanicuppup, upwards
4Proto-Germanicubunder
5Proto-Indo-Europeanupóunder, below
6Proto-Indo-Europeanh₃ewp-

via Middle Dutch up

StepLanguageWordMeaning
1Middle DutchupAlternative form of op
Every word from Proto-Indo-European h₃ewp-