Jerza (ジェラエル Jeruza) is a canon pair between Crime Sorcière Mage, Jellal Fernandes and Fairy Tail S-Class Mage, Erza Scarlet. They have mutual romantic feelings.
Technically Erza and Jellal do NOT end up together though in the anime, they do tend to get close with each other. For example in one of the episodes Jellal and Erza were very close to kissing, but right before it could happen, Jellal pushed Erza away.
No, Ezra doesn’t end up with Gray. Erza loves Jellal and he loves her, they don’t really want to confess to each other but they are both in love.
Thankfully, by the end of the series, the confirmation came for the pair, Gray finally admitting his true feelings to Juvia, saying that she was his.