The mother in the Japanese manga and anime 《间谍过家家》 (Spy x Family): a shy city-hall clerk who is secretly an assassin, married to a spy for cover, and neither knows the other's secret.
A stock transliteration, 约 + 尔, for names like Yor, Yoel and Joel. The biblical prophet Joel is written with a different second character, 约珥, but sounds the same.