So here's something that's been bugging me.
Franconian language area.
Low Franconian (Dutch) in yellow, West Central German (Central and Rhine Franconian) in green and High Franconian in blue.
In our mod, the blue part more or less corresponds with Franconian, the green part with Rhenish and yellow with Dutch. Based on this map:
- Luxembourg, Kassel, Darmstadt and Nassau should be Rhenish
- Pfalz Franconian
- Kleve and maybe Gelre (the Southern part) Dutch
- Westfalia Low German
- Elsass Alemannic
Alternatively, we could merge Rhenish and Franconian into one 'Franconian' culture.
We could also split Dutch into Flemish (Calais, Flanders and Brabant) and Dutch or Hollandic (the rest). Otherwise, we could unite Dutch with Franconian until Dutch independence. I think most German people call themselves some variant of Dutch, so Dutch is just an endonym that stuck in the English language because of England's proximity with the Netherlands. According to
etymonline, Dutch was used for all Germans starting from the late 14th century, then used exclusively for the Hollanders (acquiring its current meaning) from c. 1600 (i.e. shortly after Dutch independence).