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I wonder if Fenn Rau and Fenn Shysa are related? Some groups of Mandalorians might have different naming rules, kind of like how in Japanese the last name is said first, so then Fenn could actually be a last name perhaps? Clans and family seem to be very important to Mandalorians, so it makes sense that they would want people to know their clan name first. Maybe in their own language, they would say their last names first, but when translated into Basic, it is reversed?
Another little nuance I've noticed with the Clone Wars and Rebels is that even though each Mandalorian forges their own armor and customizes it, each clan and group seems to have a similar color scheme and pattern, like how all the Death Watch members had roughly the same color patterns, or how all of Fenn Rau's Protectors had the same colors on their armor. Even though most customize them, there does seem to be some degree of regulation in what colors they put on their armor.
On another note, I have a theory on who Sabine's mother might be. Dave Filoni had said that he's very certain that Sabine's mother was one of the Death Watch members in the throne room when Darth Maul killed Pre Visla. I believe that she is Rook Kast, Pre Visla's second in command. She does kind of look like Sabine, especially in the Darth Maul: Son of Dathomir comic. I wonder if she is by any chance related to Jodo Kast, a Mandalorian from one of the old Marvel comics that at one point impersonated Boba Fett (which Fett did not take to kindly to). So her last name is actually Kast and not Visla. That would make her of clan Kast. So it seems that the clan represents a Mandaloran's family and blood ties, while their House represents their loyalties and allegiances.
Does anyone remember Shae Vizla from The Old Republic video game trailers? A lot of people think that she was Pre Visla's ancestor, because Pre Visla said that his ancestors stole the darksaber from the Jedi Temple, and Shae just so happens to be a Mandalorian named Vizla that participated in an attack on the Jedi Temple in the days of the Old Republic. She could have been the one that stole the darksaber. The main reason I've seen why some people don't want to support this theory is because her last name Vizla is spelled differently from Visla, which honestly, I don't see why this would be considered an issue. This was likely just a mistake, though a possible in universe reason I can think of that would explain this difference is that since Shae Vizla and Pre Visla lived about 3000 years apart from each other, in that time, the spelling of their last name could have changed. In real life, the spellings of last names often change over time, so I don't see why the same can't be true in Star Wars. I think that adds an element of realism to it.