Earlier quoted context omitted.
Vivaldi is based on Chromium, not sure it counts as much as the others you listed. Reminded me of an article from a couple days ago: https://www.scmp.com/tech/article/2160072/redcore-ceo-admits...
If you go back through the webkit->KHTML lineage then chromium was mostly created by Europeans.
Good point about the KDE origins. Prominent in that lineage is Apple though. It's debatable if Webkit would've been chosen for Chrome if it didn't already have a success story in Safari, and Apple created a ton of top-notch tooling for Webkit (Drosera etc.) and contributed significantly to the engine.