Tangut character 173B1

It can name a clan or represent Middle Chinese 精 in transcription.

Reference descriptions give it two uses: it can stand for a surname or clan name, or represent the sound associated with Middle Chinese 精 in a transcription. Middle Chinese is an earlier form of Chinese; the link here is sound, not shared meaning.

It is cited in Tóngyīn (“Homophones”), a Tangut dictionary from the 12th century. That attests to its use by then; it does not prove the character first appeared then.

Why is the Unicode name not a translation?

It labels a code point; it does not gloss the character.

“Tangut Ideograph-173B1” is an algorithmic label derived from the code point; it identifies the character, not its meaning.

The Tangut script was created about 1036 to write the Tangut language. It served official and private writing and Buddhist translation. After Western Xia fell, use continued under the Yuan and Ming, and the script became obsolete by the end of the Ming dynasty.