Germering was first reliably mentioned about 859-864 A.D. In those days it was still known as Kermeringon, but apparently it was formerly mentioned under the name Germana vel admonte.
Miestas pirmąkart paminėtas 859–864 m. Tuo metu miestas buvo vadinamas Kermeringon, bet anksčiau buvo žinomas kaip Germana vel admonte.