I don't get why in English language it is called the "Ottoman" Empire. The name of the state derives from its founder, Osman I., however how can "Osman" be transformed to "Ottoman"? For me this doesn't make any sense.
In my mother tongue, which is German, it is called "Osmanisches Reich", hence "Osmanic Empire" appears to me as a more logical English version in my opinion. https://de.wikipedia.org/wiki/Osmanisches_Reich