Thread:Tupka217/@comment-1895174-20120812173754/@comment-1038387-20120812174630

It is. He was called Adams in #9 of the tie-in series. Greg Weisman said that, even when he did the old series with Cary Bates, he felt "Adam" was too artificial, and "Adams" was more natural. So as soon as he had the chance, he changed it. He changed it for the Batman: The Brave and the Bold version in "Powerless" too.

Bruce Timm, Alan Burnett (and whoever else)'s decision to make his surname "Adams" in Justice League Unlimited is unrelated, but I guess they too felt it made more sense as Adams.

And to be honest, I think they're right.