First three letters of Abzan are a,b, then z. Then a again. Like a life cycle. You're born, you grow, you die, then you get resurrected by one of Abzan's many graveyard tricks.
Bant is like "banter", like friends do. It's the friendly colours of white, blue, and green. It helps that my group hug and pillow fort decks are both bant to help me glue that association together.
Sultai starts with an "S", hissing like a snake. Vraska has snake hair and she's green/black, but sultai also follows the S with a U to remind you blue is in there.
This is so interesting, thinking about it now I’ve never associated the wedges or shards with themes or qualities, just individual representative cards or decks I guess.
Bant is Noble Hierarch for me, and Abzan/Junk is Seige Rhino. Esper is Raffine, Jeskai is Narset, RUG/Temur I think of RUG Delver. Grixis is Mishra or Nicol Bolas.
Sultai I still always call BUG and will forever. I always think of Shardless BUG from Legacy a while ago, and I guess this one is the exception because I think of actual bugs too.