The mention of 'Isha' and 'Atama and whoever took the two names as one and the same

Sahih al-Bukhari · Book 9 · Hadith 564

حَدَّثَنَا عَبْدَانُ، قَالَ أَخْبَرَنَا عَبْدُ اللَّهِ، قَالَ أَخْبَرَنَا يُونُسُ، عَنِ الزُّهْرِيِّ، قَالَ سَالِمٌ أَخْبَرَنِي عَبْدُ اللَّهِ، قَالَ صَلَّى لَنَا رَسُولُ اللَّهِ صلى الله عليه وسلم لَيْلَةً صَلاَةَ الْعِشَاءِ ـ وَهْىَ الَّتِي يَدْعُو النَّاسُ الْعَتَمَةَ ـ ثُمَّ انْصَرَفَ فَأَقْبَلَ عَلَيْنَا فَقَالَ ‏"‏ أَرَأَيْتُمْ لَيْلَتَكُمْ هَذِهِ فَإِ…

Narrated `Abdullah: "One night Allah's Messenger (ﷺ) led us in the `Isha' prayer and that is the one called Al-`Atma [??] by the people. After the completion of the prayer, he faced us and said, "Do you know the importa…