Poetry or literature
In a Vietnamese context, the name is typically associated with poetry, literature, or a graceful, smooth quality. It is a rare, short name that conveys a sense of artistic refinement and intellectual depth. In other linguistic contexts, it may appear as a diminutive or a rare phonetic variant, but its most established usage as a formal name is Southeast Asian.
Less common today
Tha isn't in the latest US Top 1000. It last peaked at #10,033 in 2014.
US births per 5-year period, 1990βpresent (SSA data).