I don't understand why Most Numerous Or Common was "Deleted by Community" just now.
Personally, I'm inclined to agree with the only existing answer, which says that there's something not quite right about the OP's construction "Buckley is the 99th most numerous name in Ireland."
But I don't understand exactly why I take that position, particularly given that I don't seem to have the same problem with ""The most numerous members of this network are relatives living within one mile", as put forward in a comment.
Because the question has been deleted by "a moderator", I can't even vote to undelete it.
So I've really got three issues here. First, I'd like the question reopened so it can be kicked around a bit in hopes that I might gain some understanding of the grammatical issue involved.
Second, I'd like to know what the actual reason for deletion was in this specific case.
Third, I'd like to know why "Community" is able to delete questions without giving a reason. If a deletion somehow represents "policy" on the part of TPTB, surely we all need to know the reason, if only so we can fall into line with (or remonstrate against) site policy.
UPDATE: I'm satisfied with @Reg's answer, but I'll just point out here that because I thought the question itself was "interesting", I re-asked it myself on main.