Whether MacLean is spelled with an upper-case L or lower case; whether it is Mc or Mac--it matters not! All spellings are correct. The clan is Highland and Western Isles. My ancestors from Mull spelled the name McLean. Two generations after emigration, one branch ( that of my g-grandfather ) had changed the spelling to MacLean.

The Chief, BTW, uses a lower case L! So do all the chieftains, I believe. I am happy, thank you very much, with the capital L.