The story
- Biblical Hebrew · derived fromיִמַּח שְׁמוֹ“may his name be erased”
- Yiddish · borrowed fromימח־שמו“may his name be obliterated”
- English todayyimakh shemo
From Yiddish ימח־שמו (yimákh shmóy, “may his name be obliterated”), in turn from Biblical Hebrew יִמַּח שְׁמוֹ (yīmmaḥ šəmō, “may his name be erased”).
Etymology from Wiktionary, CC BY-SA 4.0.