`  :::::::As to you last point, if a title is ambiguous, then it's not the clear primary topic for that title. Encyclopedia Britannicalists the article under ``Commonwealth, also Commonwealth of Nations``. with no ``The`` shown anywhere. It's their choice that ``Commonwealth`` is the primary topic for the CoN, but for WP, it's not. In Merriam Webster's Dictionary, Geographical section, it's under ``Commonwealth of Nations, also Commonwealth``, but no ``The``. The ``The`` is just stylistic, and we don't generally see it capitalized in most pubilsehd sources. So the alternative is to have Commonwealth (association of nations), or something similar, as a DABbed title. In the end, the other common alternate title, Commonwealth of Nations works best, as it is already disambiguated. -   `