Otto m
German: originally a short form of the various Germanic compound personal names containing the element od, ot prosperity, fortune, riches (cf. the corresponding Old English ēad in names such as EDWARD (SEE Edward) and EDWIN (SEE Edwin)). St Otto of Bamberg (d. 1139) was a missionary to the Pomeranians. Otto the Great (912–73) is generally regarded as the founder of the Holy Roman Empire, and the name has been borne by several members of German and Austrian royal houses.
First names dictionary. 2012.