Where does “Parisaidd” come from?

Parisaidd (Welsh) comes from Welsh -aidd, from Middle Welsh -eið — adjectival suffix, -like, -y.

Ancestry of “Parisaidd”, step by step

StepLanguageWordMeaning
1Welsh-aiddadjectival suffix, -like, -y
2Middle Welsh-eiðadjectival suffix, -like, -y
Every word from Middle Welsh -eið →Every word from Welsh -aidd →