U Thant
Mononyms are common in Myanmar. U Thant, a Myanmar diplomat, was the third Secretary-General of the United Nations (1961–71). "U" is an honorific in Burmese, roughly equal to "Mr". "Thant" was his only name, per local convention. In Myanmar, he was known as "Pantanaw U Thant", in reference to his hometown, Pantanaw.