Where does “lososek” come from?

lososek (Czech) comes from Czech losos, from Proto-Slavic lososь, from Proto-Balto-Slavic laśas, from Proto-Indo-European laḱs- — salmon, trout.

Ancestry of “lososek”, step by step

StepLanguageWordMeaning
1Czechlosossalmon
2Proto-Slaviclososьsalmon
3Proto-Balto-Slaviclaśas—
4Proto-Indo-Europeanlaḱs-salmon, trout
Every word from Proto-Indo-European laḱs- →Every word from Proto-Balto-Slavic laśas →Every word from Proto-Slavic lososь →
lososek — Etymology, Origin & Word History | Etymology Explorer