The spelling of the word "koerber" follows the German phonetic rules. In IPA phonetic transcription, it can be spelled as /ˈkœʁbɐ/. The "oe" is a way to denote the German umlaut sound, which sounds like a mix between "o" and "e". The "r" is pronounced with a guttural sound at the back of the throat. The "b" is pronounced as in English, but the final "er" has an unstressed, reduced vowel quality similar to the "a" in "sofa". The spelling of "koerber" follows these phonetic rules precisely.
The surname "Koerber" is of German origin. It is derived from the Middle High German word "kerwe" or "korb", which means "basket". The suffix "-er" indicates the occupation or the agent of something. Therefore, "Koerber" originally referred to someone who made or sold baskets. Over time, this occupational name turned into a hereditary surname and has been used by various families over the centuries.