Unfortunately, the aquatic hero isn’t incredibly happy to hear his mother’s name, as he clearly feels a good amount of resentment towards her.
And while we don’t actually learn what the favor is, the subsequent sequence reveals that he was after Atlantean armor and a quindent.
Mera starts by acknowledging that Arthur is not only part of some pretty important lineage, but has been away from Atlantis for a good amount of time.
Referring to him as neither Arthur nor Aquaman, Mera instead addresses him as the “first son of Queen Atlanna,” surprised by his return and throwing an “At last…” at him.