ScriptReference/AssetDatabase.RenameAsset

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ScriptReference/AssetDatabase.RenameAsset

https://docs.unity3d.com/ScriptReference/AssetDatabase.RenameAsset.html

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Comment by RobD6:

Note that the 2nd parameter needs to not include the path.
Correct usage is:

AssetDatabase.Rename("Assets/Textures/OldName.png", "NewName.png");

NOT:

AssetDatabase.Rename("Assets/Textures/OldName.png", "Assets/Textures/NewName.png");

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Comment by @fdegryse:

The extension of the original asset name will automatically be added to the new name if it is missing or if the specified extension of the new name is different.