E-ris. (ie like Eric but an s at the end).
But (as someone who studied Classics), personally I would struggle to get calling a kid after the goddess of spite, strife, discord, rivalry, etc. She’s not a nice goddess. Caused the Trojan war and the deaths of thousands for a laugh, because she didn’t like to see people being happy and getting along. (The only positive thing you can say about her is a passage from the poet Hesiod about how as well as the bad type of Eris, there’s a good type that causes people to compete against each other and so get better at their skills).
But don’t know if the name also comes from another culture with a different connotation (and so possibly a different pronunciation)