The Seven Houses of Ynys Pryd

In my world there are seven royal houses or kingdoms.

They are:

1. Nysse - Known as the House of Nysse; the people are called, Nyssi
2. Mora - Known as the House of Mora; the people are called, Moran
3. Deira - Known as the House of Deira; the people are called, Deiranni
4. Ceirdwyn - Known as the House of Ceirdwyn; the people are called, Ceirdi
5. Catrin - Known as the House of Catrin; the people are called, Catrinni
6. Mabyn - Known as the House of Mabyn; the people are called, Mabii
7. Annwyl - Known as the House of Annwyl; the people are called, Annites