Based on: riechen (nach)
Word Family
The core idea of this root was:
smoke, cloud
And also the idea of belching (what you do when you stand in a cloud of smoke).
The main offspring in English is reek but the root is also the origin of the name of Iceland’s capital Reykjavik, which meant “bay of smoke” and of the word Ragnarok, which was about the “twilight, mist” of the Gods.