Erm... Ruth is a very common English first name (and slightly less common surname).
My boss at a previous school was called Ruth, for instance. I know someone in American called Ruth (though she goes by a nickname because Ruth is seen as old-fashioned). And then there's Babe Ruth and other famous "Ruth"s, first or last name. It wouldn't be short-sighted to assume it was a person's name at all. And that's exactly my point. Any system of naming will run into a name from some other place sooner or later.