I posted this on reddit's /r/mistborn page, but figured I'd post it here since I hadn't seen anyone mention it.
It was bothering me who Aradel was descended from. His name didn't show up anywhere in any previous books, but this was stated:
It was also stated that he didn't have a drop of noble blood in him. So who was his progenitor?
I was playing a game with my wife over the phone on the way home from work yesterday. She hasn't started either of the Era 2 books, so I was trying to hype her up by giving her hints as to people's families' fates in the new era. So she'd name a name from Era 1, and I'd say hints of how they were referenced in Era 2. She says, "Captain Goradel." I stopped, thought about it, and the lightbulb turned on. That's Aradel's ancestor.
I did a google search of "Goradel Aradel" and came up with the user page for a 17th Shard poster named Aradel, whose uncle was the real-life inspiration for Goradel.
On a separate note, it seems that Aradel's been groomed by Harmony to take his place as the leader of Elendel. We know that Brettin was killed somehow toward the end of AoL, and replaced by TenSoon. We don't know why he was replaced, but I surmise that Harmony was already planning ahead to have Aradel placed as the leader of the new Elendel government. He saw the opportunity for Aradel to replace Brettin, but needed time to have this happen, so he had TenSoon replace Brettin, giving them time to get Aradel in place as his successor. "Brettin" announces his retirement shortly after being replaced by TenSoon, Aradel comes out of retirement, probably prodded by "Brettin" to take over his job, and here we are...noble power has diminished tremendously by the end of Shadows of Self, and a good man, a man whose ancestor died saving the world (literally, without his death, Marsh would never have known to remove Vin's earring), who truly has the best interests of the people at heart, is now in charge of Elendel.