The vilest name in Allah's sight is Malik al-Amidh (King of Kings). The narration transmitted on the authority of Shaiba (contains these words): There is no king but Allah, the Exalted and Glorious. Sufyan said: Similarly, the word Shahinshah (is also the vilest appellation). Ahmad b. Hanbal said: I asked Abu 'Amr about the meaning of Akhna. He said: The vilest.  

عَنِ النَّبِيِّ ﷺ قَالَ إِنَّ أَخْنَعَ اسْمٍ عِنْدَ اللَّهِ رَجُلٌ تَسَمَّى مَلِكَ الأَمْلاَكِ زَادَ ابْنُ أَبِي شَيْبَةَ فِي رِوَايَتِهِ لاَ مَالِكَ إِلاَّ اللَّهُ ﷻ قَالَ الأَشْعَثِيُّ قَالَ سُفْيَانُ مِثْلُ شَاهَانْ شَاهْ وَقَالَ أَحْمَدُ بْنُ حَنْبَلٍ سَأَلْتُ أَبَا عَمْرٍو عَنْ أَخْنَعَ فَقَالَ أَوْضَعَ