@dyinglighter2077: That's how the game handles object names in such cases. Usually if an asset consists of multiple objects, they're called by their distinctive names, but objects can be also called by class names + suffix. Suffix is coming from extra index for cases when multiple objects has the same name and different extra index (like mesh sockets). At some point I thought it's related to modified exports/imports, but failed to understand what exactly is expected instead of class name there. It's probably related to their customization and animation systems, which are very custom solutions.
As for the head and body for the mentioned case - those are two separate assets with separate meshes. If you mean how to combine them in umodel, append both meshes to currently loaded set, then scroll between them and use tagging (Ctrl+T) for both. It's explained in recommended tutorial from
tutorials section among other things.
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