"The Messenger of Allah ﷺ said: 'Do not let the Bedouin make you change the name of this prayer of yours, for they delay the prayer until it is very dark because of their preoccupation with camels and milking them. Verily, it is 'Isha'.'" (Using translation from Nasāʾī 541)
قَالَ رَسُولُ اللهِ ﷺ إِنَّهَا صَلَاةُ الْعِشَاءِ فَلَا يَغْلِبَنَّكُمُ الْأَعْرَابُ عَلَى أَسْمَاءِ صَلَاتِكُمْ فَإِنَّهُمْ يُعْتِمُونَ عَنِ الْإِبِلِ