慕: Attachment, aspiration. In names, it often conveys a sense of yearning, admiration, and lofty aspirations.
勒: Command: Rein in at the brink of the precipice.
Meaning: The name 'Mule' harmonizes in sound, with 'Mu' conveying admiration and aspiration, and 'Le' suggesting discipline and motivation, imparting a sense of quiet determination.