This is a linguistic issue. The Modern Turkish name for the Ottoman Empire is Osmanlı İmparatorluğu, which clearly comes from Osman and not Ottoman.
Many Arabs, even to this day, do not pronounce the letter "thaa" (ث) correctly. It should be pronounced as the "th" in "thin", but many Arabs pronounce is like the "s" in "some". As a result, the Caliph Othman would be mispronounced Osman. Since Turkish does not have a "th", the Turks went with this Arabic mispronunciation by naming their children Osman. English, however, had the "th" and therefore called the Empire the Othman Empire before the "th" was weakened to just a "t" and you have the Otman Empire which changed vowels (as is common in English phonology) and became the Ottoman Empire.
Osman I is attributed to finding The Ottoman Empire.
He effected the Empire by extending the Ottoman Empire towards the end of the Byzantine Empire .
The Ottoman Empire was established by Osman I in 1299.
The Ottoman Empire was named after it's first leader Osman I.
Turkish people are founders of the Ottoman Empire.
Osman I is attributed to finding The Ottoman Empire.
Osman
Osman I, a leader of the Turkish tribes in Anatolia, founded the Ottoman Empire around 1299. The term “Ottoman” is derived from Osman's name, which was “Uthman” in Arabic. The Ottoman Turks set up a formal government and expanded their territory under the leadership of Osman I, Orhan, Murad I and Bayezid learn more about here madnitv
He effected the Empire by extending the Ottoman Empire towards the end of the Byzantine Empire .
The Ottoman Empire was established by Osman I in 1299.
The sixteenth sultan of the Ottoman Empire was Osman II.
Osman I
The twenty fifth sultan of the Ottoman Empire was Osman III.
The Ottoman Empire was named after it's first leader Osman I.
Turkish people are founders of the Ottoman Empire.
Osman the first (1258-1324).
osman bey (othman)