Shia (Yiddish: שיע) is a diminutive of the name Joshua (Hebrew: יְהוֹשֻׁעַ), although it's easily confused with Shaia (Yiddish: שעיה), a diminutive of the name Isaiah (Hebrew: יְשַׁעְיָהוּ).
Similar confusion occurs with Heshel (Yiddish: העשל; Hebrew: הֶשְׁל), another diminutive of Joshua, and Hirshel (Yiddish: הירשל), a diminutive of Hirsh (Yiddish: הירש), which is a calque of Tzvi (Hebrew: צְבִי).
Similar confusion occurs with Heshel (Yiddish: העשל; Hebrew: הֶשְׁל), another diminutive of Joshua, and Hirshel (Yiddish: הירשל), a diminutive of Hirsh (Yiddish: הירש), which is a calque of Tzvi (Hebrew: צְבִי).