When naming a boy with the surname Liu, it is best to use ancient poems as the source, taking into account both pronunciation and meaning.

Liu Jianju (jianju),

Jian means clear spring in the mountains; Ju means beautiful jade. Jianju is a beautiful jade washed by mountain spring water! The spring water is always flowing, and the beautiful jade becomes more crystal clear, smooth, simple, and elegant because of the protection and washing of the mountain spring! This word comes from the Book of Songs