Random Worldbuilding Thought: Pony Tribes and Naming Conventions

I had a thought recently for some worldbuilding regarding family structures and naming conventions among the three tribes of ponies. There's not a ton of hard evidence to support these ideas, but they provide one explanation for (some of) what we see in the show, and they help each tribe stand out a little from the others.

Basically: the three tribes view themselves and their families differently, which leads to differences in naming. The differences were more important historically, when pony tribes were less united, but the rules are somewhat relaxed these days.

• Earth Pony families form loose, informal clans, each of which has a particular specialty (e.g., Apples, Cakes). Individuals' names usually have something to do with their clan(s), but naming conventions are flexible, and ponies frequently change their names after major events, especially marriage. Either partner in a marriage can change their name; often who makes the change reflects which clan the new family is most closely aligned with.
  Example: Chiffon Swirl (from the Cake clan) marries Cooked Carrots (from the Carrot clan). The two want to start a bakery, so they change their names to Mrs. Cup Cake and Mr. Carrot Cake, respectively.
  Another Example: The parents of Igneous Rock Pie came from the Rock clan and the Pie clan, the latter of whom is related fairly closely to the Cake clan. The fact that Igneous was given both surnames isn't unusual; the fact that he kept both names, post marriage, is believed to be in poor taste, and speaks to his stubbornness.
  Not quite name lore, but: Earth Ponies tend to recognize each other as "cousins," regardless of their actual blood relation. As such, earth ponies tend to be more willing to help each other out, even without being asked.
  Example: The Carrots and the Apples regularly help each other with day-to-day chores around the farm; however, due to long tradition, harvest time is the exclusive domain of each extended family.
• Unicorns, even low-born ones, form Houses. Most of them tend to think in terms of their family unit, and, especially in higher-status families, tend to make decisions based on how they reflect on the family as a whole. Inter-House relations are often complex and deeply political; hence, unicorns tend to make decisions about friends or marriage partners based on the needs of the House, rather than for love or friendship. In fact, many high-status unicorn parents will actually arrange marriages for their children--or at least screen a number of potential suitors for them to court. For these reasons, friendships between unicorns are often more reserved, with many ponies instinctively avoiding deep connections that could be problematic for their House later on.
  More traditional unicorns tend to identify themselves by their house, e.g., "Blueblood of House Platinum," "Twilight of House Sparkle," or "Rarity of House Belle-Dame."
• Given their warrior culture, Pegasi tend to think in terms of Lineages. They have a strong sense of geneology, and most can rattle off at least three or four generations of their direct ancestors from memory. Most pegasi claim descent from a particularly famous hero, celebrity, warrior, etc., and identify themselves by that descent, e.g., "Rainbow Dash, Granddaughter of General Firefly" or "Rumble, Scion of Thunderhead", though they tend to only do this with other pegasi. In mixed company, they are more likely to identify by their immediate relatives, e.g. "Fluttershy Breeze-daughter." At least, in a world where Zephyr Breeze was named after his mother. Given this emphasis on lineage, a common keepsake in pegasi homes is the family tree, often prominently displayed as, say, a series of photos in a frame. This is why pegasi are often driven to compete and succeed--they need to shine to make their ancestors proud.
  Perhaps: Of the three tribes, pegasi are the most likely to (cough) form relationships for genetic reasons, along the lines of IRL horse-breeding. Ponies with famous ancestry, or who have particularly notable physical traits, are considered more desireable--that is, pegasi often make decisions about romantic partners based on what that partner can offer their (potential) children. Other ponies tend to see this aspect of pegasus culture as particularly shallow, which, to be honest, it often is. However, this tendency comes from the fact that pegasi are often quite concious of their own "breeding," and thus tend to view relationships through that lens.