If you have an iPod nano purchased before September 2006 (first generation) then you can download firmware which will convert the interface on your music player into Latvian.
To install the Latvian firmware you’ll also need to download the iPodWizard utility which is currently only available for Windows.
The latest generation of iPods fully support Latvian text in the display of track names, genres, artists and notes both on the iPod LCD display as well as the accompanying iTunes software (Windows & Macintosh). In 2003 the iPod began supporting Unicode and the ability to display Latvian text. If you have an older model that displays in Latvian then send us the details of your iPod model and software version and we will include it on our list.
More details at Apple.