Both words are good names.
Which word is better to choose when naming Lun or Lun mainly depends on personal preference and the overall meaning of the name. The word "Lun" is usually related to "Kunlun", symbolizing the towering mountains and implying the future of the child. To be as tall and strong as a mountain, and to move forward without fear of difficulties.
The word "Lun" puts more emphasis on the relationship between people, moral ethics, etc., which means that children can have noble moral qualities in the future and become pillars of society.
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