German toponymy is a fancy way of saying the study of place names in Germany. This means looking at all the different names of cities, towns, mountains, rivers, and other places in Germany and trying to understand where the name comes from and what it means.
When people name a place, they usually pick a name that makes sense to them based on their language, culture, and history. For example, the name "Berlin" comes from two Slavic words, "berl" (swamp) and "lyn" (pool), because the city used to be located in a swampy area.
Sometimes, when a place is named, it can also tell us something about the people who first named it or its history. For example, the name "Aachen" comes from the word "aha" (water) and was named after the hot springs in that area that were sacred to the Roman god of healing.
German toponymy is important because it helps us understand more about the culture and history of Germany. By looking at the names of different places, we can learn about the different languages and groups of people who have lived in the area over time. It also helps us preserve and celebrate the local history and traditions of these places.