Bone_Rename is a Blender addon from VFX Grace built for renaming across several data types. It can batch rename bones, objects, materials, and vertex groups, with operations that include adding prefixes and suffixes, replacing specified characters, and deleting specified characters. The addon also lets you add name presets so bones can be named quickly.
Each data type has its own set of tools. For bones, you can use presets to intelligently rename, rename selected bones, add prefixes and suffixes, delete or replace specified characters, and delete bone constraints. Objects, materials, and vertex groups each support renaming, prefix and suffix additions, and character deletion or replacement. Vertex groups can also be deleted through the addon.
Bone_Rename installs through Blender's standard method: open Preferences, go to Add-ons, choose Install, and select the zip. Documentation is provided. Version 1_2_3 added two new sorting methods to “Select bone to rename” in the Bone tab, added support for Blender 2.93, and fixed a bug where some objects failed to rename.