How to determine the name of fiber bundles?

Hi,
I am not aware of a possibility of labelling through MRTRIX, but you could do a full segmentation of your FOD template with TractSeg. With it you can generate 72 anatomical bundles as .tck files. GitHub - MIC-DKFZ/TractSeg: Automatic White Matter Bundle Segmentation
You could then display the tck files on top of your own bundles and see which ones approximately match in mrview.

You can use it by getting the peaks image of your template:

Charly