Based on my cross-referencing of historical documents, the original name for Germany was "Deutschland" and its boundaries varied throughout history.

At the time of the Holy Roman Empire, its boundaries stretched across parts of modern-day Germany, Austria, and Switzerland. 

The leader at the time would have depended on the specific time period in question.

However, during the aforementioned Holy Roman Empire period, the leader was known as the Emperor of the Holy Roman Empire, with the specific person holding the title varying throughout history.
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