Joy, gladness
Letzy is a modern diminutive form of Leticia, which is derived from the Latin name Laetitia. It conveys a sense of happiness and cheerfulness, often used as a standalone name in Spanish-speaking communities.
Less common today
Letzy isn't in the latest US Top 1000. It last peaked at #7,155 in 2000.
US births per 5-year period, 1990βpresent (SSA data).