Hey thanks for bringing us back into the charming era before Google and Wikipedia, since you used the traditional way of asking questions, here is a traditional answer based on a real book not wiki,
The Unimog has its origins in the closing days of WW2, that were dark for Germany, the prevailing notion at Daimler-Benz then was to have a vehicle that would do agricultural jobs in the absence of any industry that would take some time to rebuild, so Wilhelm Haspel, the head of Daimler-Benz at that time, instructed Albert Friedrich, the head of aero engine division to come up with such a vehicle
It was originally built at Erhardt and Sohne, with the enginefs of the 170 V Mercedes Benz supplied to it
It was funded by a shoe manufacturer and initially did not have the Benz Star!
From 'Mercedes' by Rainer W Schlegelmilch