The word Germany comes from the word diot, which means people. It was first seen in the 8th century AD and refers to the dialect spoken by Germanic tribes living in the eastern part of the Frankish kingdom.
for example, F. Schiller once said: Deutschland? Where is it? I can't find that place. Where the academic Deutschland begins, the political Deutschland ends. Only two countries in the world, China and Japan, are called Germans, while most other countries call them Germans.
As for the word Germany, it is not derived from the name of a certain tribe or a certain country, but developed in the opposite direction: Germany-German-German country. It is also completely correct. This is also considered from the perspective of the birth of a country and a nation. From the linguistic point of view alone, the relatively simple word DEUTSCH is probably given by outsiders just like Germanic.
About the origin of the word Germanic:
Germany originated from Latin, a word borrowed from ancient Gaul, which means "neighbor". At first, Caesar, the Roman ruler, called the residents on the east side of the Rhine in the Battle of Gaul, and later it became "belonging to Germanic people".
Because the British are also Germans, they have always called Germany "Germania", that is, Germany, and the crowd word is Germany. Y is an English suffix, and both words refer to "Germany".