Eve is a male cat and has been Ellie Goulding's ever since the start of 2017. The cat's name, "Eve" was revealed when Goulding replied to a fan on Twitter. [1]
Eve is a white cat (presumably male) with a grey-blackish tint on its ears, paws and nose. It is currently approximately thrice as small as Ellie's other cat Wallace and seems to be friends with Wallace also. [2]
It is speculated that the cat was named 'Eve' as Goulding had adopted the cat on New Year's Eve. Eve may have been a replacement for Lennon.