Appears to be a Prussian Regimental crown symboll possibly 3rd regiment? Edge is signed as shown in photos. Im unsure of the name, your guess is as good as mine(see photos please). This sword is highly decorated which is rare, and really intricate as shown on both sides of blade, as well as edge where it may hold the keys to exact identification of who owned it, ect.
It is most likely The officers name. On edge as theres a title font in front, More research is needed i just dont know exactly. Please view all photos, any questions please.