User blog comment:Godisme/Spotlight Brocken/@comment-1268838-20110317042210/@comment-3344282-20110317130101

Besides what Mohrpheus already looked up, Brocken as a word in German refers to a (huge) piece or chunk of something - hence the name of the mountain. It could also refer to a really tall/fat/muscular person... You get the idea. But I suspect that it is misspelling of Broken, because the chapter occurs during night and Ichigo stands near a spotlight in the alley when he encounters Isshin and Uruhara and his trust into Uruhara starts to break. Either way, a terrible chapter name.