Kaiser is simply the German word for "emperor". It's not used in Germany as a given name at all.
― Anonymous User 10/24/2020
2
Kaiser is not the German form of the name Caesar, it is the German word for "emperor". It is not used as a first name in Germany, only as a surname. [noted -ed]
We do not have "Kaiser" (meaning "emperor") as a first name here in Germany, only as a last name. The German version of "Caesar" would be "Cäsar" and it is pronounced like "TSAY-zar".