Where does “cockboat,cog” come from?

cockboat,cog (English) comes from Dutch kogge, from Middle Dutch cogghe, from Proto-Germanic kuggō, from Proto-Indo-European gugā, from Proto-Indo-European gēw- — to bend, arch.

Ancestry of “cockboat,cog”, step by step

StepLanguageWordMeaning
1Dutchkoggecog
2Middle Dutchcogghe—
3Proto-Germanickuggō—
4Proto-Indo-Europeangugāhump, ball
5Proto-Indo-Europeangēw-to bend, arch
Every word from Proto-Indo-European gēw- →Every word from Proto-Indo-European gugā →Every word from Proto-Germanic kuggō →