the confusion is because of the entymology of the word.
I quote:
Sheikh, also rendered as Sheik, Cheikh, Sjeik, Shaykh, Shaikh, Sheekh, Sheyh, Šeih, Šejh, Şeyh and other variants (Arabic: شيخ shaykh; (in Urdu شیخ, Shiekh); pl. شيوخ shuyūkh), is a word or honorific term in the Arabic language that literally means "Scholar".