This is Movie 3, "Fade to Black." Since the concept this time was a "return to origins," the story ended up centering primarily around Ichigo and Rukia. When it comes to a story about the bonds and "power" that a "name" holds, I suppose the arcs involving Kenpachi and Yachiru, or [their] flashbacks, might come close to that. The moment Ichigo first used Getsuga Tensho is also a similar theme. This concept of a "name" is a theme deeply intertwined with BLEACH itself. Even the names of the sister and brother who form the core of this story were ultimately the very first ones that suddenly popped into my mind. That aspect, too, is a unique characteristic of "names."