Why do they call an elbow an elbow?

The Word elbow has Germanic origins. Etymologically, the Word elbow means "bend of the forearm." The Word is derived from the old Germanic Word alinobogan which then gave rise to the Old English Words of elboga and elnboga for elbow. The Word is formed from the combination of linã meaning forearm and bogan to bend or arch. Bogan also gave rise to the English Word bow.