He's a 2001 defender with Hamburg's U-15's who's also apparently eligible for Germany and Nigeria. The only proof I can find of him being eligible for the USA is TDS, but they are incredibly reliable. I don't think they'd list a non-American kid. http://www.topdrawersoccer.com/club-player-profile/brooklyn-ezeh-antony/pid-91798 Initial credit to OWTY for listing him.
He is listed on the club's web site, but not as having non-German citizenship as the team sometimes does for other players.
Fussball Talente, which is another database lists him as Nigerian, which might not be true, but I'm not sure if we know totally what his relevance is to YA. TDS did list him, so I think he's at least worth tracking for now.
He's a starter for the U-17's at LB, played one game at CB. Scored two goals and also has an assist. On Hamburg's transfermarkt forum, they have about 10 pages this season of youth discussion, and he's barely been mentioned, which usually isn't good news. They update the thread regularly, not really seen much description on him, but he's playing regularly, so maybe he's a decent player.
2 year later bump, moving to Schalke U19. still 0 indication he's American. Seems to be all German-Nigerian.