https://wowpedia.fandom.com/wiki/Dracthyr#Notable
Based on those examples, three common features regarding Dracthyr names seem to be:
- Their names can reference the colour of their scales. Viridia, viridian, green. Azurathel, azure, blue.
- Their names can reference the elements associated with dragons of the same colour. Emberthal, embers, black dragons breathe fire. Cindrethresh, cinders, red dragons also breathe fire.
- Their names often seem to the letters ‘th,’ also known as a thorn. Emberthal, Azurathel, Cindrethresh, Sarkareth.
Based on this, you can probably get a strong idea of what a lot of other Dracthyr names are going to be like.