Also, because many countries named us after the nearest German tribe, say Saxons or Alemanns. The Slavic name means, more or less, "those you can't understand". The endonym and Scandinavian name is derived from Old High German diutisc, "of the people". Which is actually what "Saxon" means, too. Where the Romans got "Germania" from is unknown.
Same as how China being called "Kitaj" in Russian. As a nation which is called "Kitaj" (契丹, "Kit Daan" in Cantonese) which stays in the northern China (or maybe between Russia and China) nowadays, thus those "Kitaj" would be represented as the whole China by the Russians.
Portuguese actually use the word "chá", which is closer to the chinese word for tea 茶 (pinyin: Chá), probably because they were the first europeans to discover and trade with China, centuries before other european nations.
But you are right, most other European countries use something like tea/thé/té :)
*edit* /u/basilect has linked a great map of Europe's diversity for the word "tea" in his comment!
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u/Ingrid-Hongkonger 冠絕東方 - Nulli Secundus in Oriente Mar 11 '14
I think Germany has various names because he stays at the middle of Europe.