Ottoman empire’s name

Yes emperor is correct.But they used Osmanli devleti.devlet=government or country.Osman bey is the founder so it has his name Osman(li)

the transilated history book i have written by Farid Bek calls the Ottoman sate as " Al Dawlah Al Othmaniyah"

also in Arabic books it was mentioned as "Dawlat Aal Othman" which meant " the sate of Othman family"

also i think the proper name is "The Sultanat of Othman." because it was ruled by Sultans

i remmember reading a message sent by Suleyman alqanoni to the French King, in that message Suleyman's title was  the Sultan of the Sultans and the maker of the Kings.

nice Message shows how confident he is about his power. i think it was mentioned in Jawdat Basha history.

Usually it is referred to as 'Devlet-i Ali Osmani' as Azimuth wrote. Like all empires it is referred to by the name of its ruling dynasty.

In English it is called Ottoman because what the Turks pronounce 'Osman' is 'Uthman or Othman' in Arabic original/Arabic script. Turkish has no 'th' so it becomes 's'. The English word probably originated from written sources.

Why it is in English Ottoman and not Osman or Ozman whatever.

Other meaning of the name Osman is Oghuzman, you maybe know mostly of the Turks in Turkey where then (and still know) Turkmens who are part of the Oghuz boy (like family three).

Ive heard in Algeria and some North-Afrikan country they call their sons Othman (called Ozman).

ALternative names for Turkey whas called by Ziya G�kalp whas Oghuzistan. But they prefer Turkiye because it whas the only Turkish state then it that times.  

I agree, because the sound "th" doesnt exist in Turkish, Turks pronounced it as Osman. We also call Muhammed "Mehmet", because of Turkish grammer rules.