It’s something I was wondering. I got the shell bed recipe from my friends peppy islander on her island and then today got the same recipe by my peppy islander. Coincidence or are some recipes depending on personality type?
I honestly have no idea - the recipes I have gotten from villagers while being in their houses have all related to the furniture they have, e.g. if they use the wood-block series, they give me a wood-block recipe. So if there's a connection between series and personality, then there is likely a connection between recipes and personality too.
I've gotten a lot of random recipes. Sprocket (a jock) gave me a recipe for a bamboo wall decoration today. He doesn't have any bamboo furniture in his house. He's also given me recipes for firewood and a stacked firewood wall which seem much more jock-y, though. It might be like balloons where there's a good chance that the recipe will correspond with the villagers' own tastes and interest, but a small chance they'll give you something random.
I've noticed that the messages in a bottle all kinda seem like they were written by a specific personality type, so maybe those behave the same way?
e.g. on Friday I got the bamboo floor lamp recipe from a normal personality villager on Oblivia's island. Then yesterday Norma (also normal personality) was making one on my island.