Can the boy be named Liu Heng?

The boy's name is Liu Heng, which is not pleasant to hear, let alone ugly.

Because "horizontal" is an uncommon word, it is acceptable.

Matters needing attention when naming are:

First, there are no uncommon words.

Second, there are no homophones that are easy to make fun of.

Third, it is not awkward to read.

You did two of the above three.

You can scream if you want.