Where does “יאָסל” come from?

יאָסל (Yiddish) comes from Yiddish יוסף, from Hebrew יוֹסֵף — shall add.

Ancestry of “יאָסל”, step by step

StepLanguageWordMeaning
1YiddishיוסףJoseph
2Hebrewיוֹסֵףshall add
Every word from Hebrew יוֹסֵף →Every word from Yiddish יוסף →