Ertuğrul is a Turkish male name, the name of the father of Osman I, founder of the Ottoman Empire. The name is composed of Turkish er (man) and tuğrul (referring to a mythical bird of prey, perhaps based on a falcon).
Ertuğrul is also a Turkish surname originating from the given name.
Meaning: “man + bird of prey”, possibly in reference to a falcon”
Pronunciation: in Turkish the ğ is a silent letter so Ertuğrul in Turkish is pronounced as er-tu-rel (Forvo)
Osman is the Turkish and Kurdish form of Uthman, an Arabic male name meaning “baby bustard” (bustards are large terrestrial birds that live in dry grasslands and steppes). Osman I was the founder of the Ottoman Empire.
Osman is also a surname- a Turkish surname originating from the given name, but it’s also an English surname, a variant of Anglo-Saxon Osmær meaning “god + fame”, made up of Old English os (god) and maer (fame), though it may also be a variant of Osmond “god + protection”.
Origin: Arabic; Proto-Indo-European
Meaning: “baby bustard”; also an English surname “god + fame” or “god + protection”