Where does “ayd's” come from?

ayd's (Manx) comes from Manx -s, from Old Irish -sa — emphatic first-person singular suffix.

Ancestry of “ayd's”, step by step

StepLanguageWordMeaning
1Manx-s-self
2Old Irish-saemphatic first-person singular suffix
Every word from Old Irish -sa →Every word from Manx -s →