If its ok, I answer Your question in english.;)
There are many dialects also in Lithuania. One of them belongs to Zemaiciai. Long ago when Germans came to Lithuania, they had strong helms. When zemaiciai where beating thourgh the helm, certainly, nothing was happening to germans. So, in dialect zemaiciai were telling: "vot kiets!". That means:"so strong". Also, later came a name for german "vokietis" and the land "Vokietija". I hope, I could help You.;)
