If she had heard him, she didn't say anything.
It was probably for the best. There were already too many words between them, too many things that could never be unsaid.
...Fiancée...
In all honesty (a term whose irony did not escape him) there was a slim chance that his voice had risen over the din of the battle surrounding them: the combined roars of seven different dragons and the screams of their comrades and the ring of steel striking steel. And yet he knew better than to underestimate her. This was Titania, the Fairy Queen, a woman who would never cease to surprise and amaze him. If he could hear the whisper of her name anywhere, over thousands of miles and the divide of death, there was no reason that she could not do the same. And even though her name may be on the lips of men the whole world over, when it fell from his it was special. He was the one who first gave it to her.
...Scarlet...
In all (admittedly ironic) honesty, he was tired of fighting. He had been fighting his whole life. In the Tower of Heaven, he had fought for survival, then for freedom. He had fought for the resurrection of Zeref, and when that nightmare had ended, he had fought for redemption. Now he was fighting for the future of mankind, an institution from which he had effectively cut himself off entirely. But when, as they battled side by side at the Festival of the Dragon King, she cried out the name of her guild before leaping into the fray, he felt compelled to combine his voice with hers. And so, lacking any other battle cry, he yelled out the name of the one thing that he still considered worth fighting for.
...Erza.