User blog comment:Nomad27/The Name Dale/@comment-29196789-20160828164815

From Volume 10 Ch. 2 Pt. 2: "In the Kingdom ― and in the Empire ― commoners had two names, nobles had three names, and titled people had four names. For the royal family, they had four names ― plus their titles for a total of five names."

So I'm guessing first and last name are the "common" names, because even commoners like the Bareare's and Emmot's share family names as their last name. That would leave the names in the middle as the noble name and the titled name. It sounds like a noble name would be something inheritted, while a titled name would be something given, but who knows.

So my best guess would be Dale being a signifier of an old family like theorized, or a common title given to certain nobles for some reason.