Source Filmmaker: How to Rename Blender Bone Easily (Working 2022)

import bpy
context = bpy.context
obj = context.object
#you still need to fix it up until the point you would normally rename the bones
#credit to Hallow for original script https://gamebanana.com/tools/6414
namelist = [

#("BoneNameYouWantRenamed", "BoneNameToRenameBoneTo")
#Example:
#("chest_a", "Spine1"),
# Templete
("Hips", "bip_pelvis"),
("Spine", "bip_spine_0"),
("Chest", "bip_spine_1"),
("Neck", "bip_neck"),
("Head", "bip_head"),
("Right shoulder", "bip_collar_R"),
("Left shoulder", "bip_collar_L"),
("Right arm", "bip_upperArm_R"),
("Right elbow", "bip_lowerArm_R"),
("Right wrist", "bip_hand_R"),
("Left arm", "bip_upperArm_L"),
("Left elbow", "bip_lowerArm_L"),
("Left wrist", "bip_hand_L"),

("Right leg", "bip_hip_R"),
("Right knee", "bip_knee_R"),
("Right ankle", "bip_foot_R"),
("Right toe", "bip_toe_R"),

("Left leg", "bip_hip_L"),
("Left knee", "bip_knee_L"),
("Left ankle", "bip_foot_L"),
("Left toe", "bip_toe_L"),


#righthand
("Thumb0_R", "bip_thumb_0_R"),
("IndexFinger1_R", "bip_index_0_R"),
("MiddleFinger1_R", "bip_middle_0_R"),
("RingFinger1_R", "bip_ring_0_R"),
("LittleFinger1_R", "bip_pinky_0_R"),
("Thumb1_R", "bip_thumb_1_R"),
("IndexFinger2_R", "bip_index_1_R"),
("MiddleFinger2_R", "bip_middle_1_R"),
("RingFinger2_R", "bip_ring_1_R"),
("LittleFinger2_R", "bip_pinky_1_R"),
("Thumb2_R", "bip_thumb_2_R"),
("IndexFinger3_R", "bip_index_2_R"),
("MiddleFinger3_R", "bip_middle_2_R"),
("RingFinger3_R", "bip_ring_2_R"),
("LittleFinger3_R", "bip_pinky_2_R"),

#lefthand
("Thumb0_L", "bip_thumb_0_L"),
("IndexFinger1_L", "bip_index_0_L"),
("MiddleFinger1_L", "bip_middle_0_L"),
("RingFinger1_L", "bip_Ling_0_L"),
("LittleFinger1_L", "bip_pinky_0_L"),
("Thumb1_L", "bip_thumb_1_L"),
("IndexFinger2_L", "bip_index_1_L"),
("MiddleFinger2_L", "bip_middle_1_L"),
("RingFinger2_L", "bip_Ling_1_L"),
("LittleFinger2_L", "bip_pinky_1_L"),
("Thumb2_L", "bip_thumb_2_L"),
("IndexFinger3_L", "bip_index_2_L"),
("MiddleFinger3_L", "bip_middle_2_L"),
("RingFinger3_L", "bip_Ling_2_L"),
("LittleFinger3_L", "bip_pinky_2_L"),


]

for name, newname in namelist:
    # get the pose bone with name
    pb = obj.pose.bones.get(name)
    # continue if no bone of that name
    if pb is None:
        continue
    # rename
    pb.name = newname