@ADK
his(Mc) surname(last name) Chen and first is fei. So she's just showing their closeness and calling his name in a cute way i guess.
@Solemmaru
it should immortal device/tool or something along those term as a blanket term
@dinkan
it should be langya (a place I believe) chen clan or just "langya's chen's". Just wanna ask again are you using MTL to translate or are native of the language or just learning I was curious.....