It is narrated from Abu Ubaydah Ma'mar bin al-Muthanna that: Amr bin al-Ahtam bin Sumayy bin Sinan bin Khalid bin Minqar bin Ubayd bin Muqa'is bin Amr bin Ka'b bin Sa'd bin Zayd Manat bin Tamim; and the real name of al-Ahtam was Sinan. On the day of the Battle of al-Kulab his two front teeth were broken (because of which he came to be called al-Ahtam, that is, the one with broken teeth).