The Messenger of Allah ﷺ said, "It is the Isha prayer, so do not let the Bedouins overcome you regarding the names of your prayers, for they call it atamah because they delay milking their camels until nightfall."
حدثنا عبد الرزاق أخبرنا سفيان عن عبد الله بن أبي لبيد عن أبي سلمة
قال رسول الله ﷺ إنها صلاة العشاء فلا يغلبنكم الأعراب على أسماء صلاتكم فإنهم يعتمون عن الإبل
Its isnad is sahih. It is a repeat of 4572, 4688, and 5100, and see also 6148. Regarding his saying "according to the names of your prayers," in a copy in the margin of M it reads "your prayers," and in K it reads "according to the name of your prayer."