Where does “SLO” come from?

SLO (Translingual) comes from English Slovak, from Slovak Slovák, from Slovak Slovan, from Proto-Slavic slověninъ, from Proto-Slavic slovo, from Proto-Balto-Slavic ślawas, from Proto-Indo-European ḱléwos, from Proto-Indo-European ḱlew- — to cover; to incline.

Ancestry of “SLO”, step by step

SLO traces back through two separate lines of ancestry.

via English Slovak

StepLanguageWordMeaning
1EnglishSlovakOf, from, or pertaining to Slovakia, the Slovak...
2SlovakSlováka man from Slovakia, a male Slovak; a male...
3SlovakSlovanSlav
4Proto-SlavicslověninъSlav
5Proto-Slavicslovoword
6Proto-Balto-Slavicślawas
7Proto-Indo-Europeanḱléwosfame
8Proto-Indo-Europeanḱlew-to hear
9Proto-Indo-Europeanḱel-to cover; to incline

via Slovene Slovénija

StepLanguageWordMeaning
1SloveneSlovénija
Every word from Proto-Indo-European ḱel-Every word from Proto-Indo-European ḱlew-Every word from Proto-Indo-European ḱléwos