Latvian
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This page offers basic guidance on typesetting a LaTeX document in the Latvian language using the Latin script.
Support with the traditional way (ldf)
The Latvian language is supported in babel in the ‘classical’ way
based on a ldf file.See babel-latvian for further details.
Support with ini locale file
Here is a minimal sample file with latvian as the main language
(assuming luatex, which is the recommended engine, and babel ≥24.14,
although it may work with previous versions).
\documentclass[latvian]{article}
\usepackage[provide=*]{babel}
\begin{document}
Local name $=$ latviešu
Chapter $=$ \chaptername
Today $=$ \today
\end{document}

Contribute
If you are a native speaker or have expertise in this language, you can contribute, make suggestion or request an enhancement by submitting a pull request, opening an issue, or contacting the Babel maintainer with the link above.