"His name and her name."
Translation:A ainm agus a hainm.
I was sure that you lenited for "his." Is this weird because of vowels or something else entirely?
The adding of an "h" before vowels isn't considered leniting. Only consonants can lenite/eclipse. Vowels have a different set of mutations, h-prothesis on vowels is triggered by a meaning 'her', as is the case here.
Indeed, and words that lenite never cause h-prothesis, neither do those that eclipse (these always cause n-prothesis). It’s the remaining ones (the ones that don’t mutate any consonants) that usually add ‘h’.
But I've see here "lena chat" with his cat. Is this a different circumstance?
Yes, I wondered that too! I had just kind of "got used" to the added h indicating HIM but now I am hesitating!!
Yes it is different because c is a consonant which is lenited. When a word is lenited the h is placed right AFTER the first letter. Vowels behave differently. Vowels get the h before the first letter. Plus the meaning is different.