Surah Ar-Rahman 55:78
تَبَـٰرَكَ ٱسْمُ رَبِّكَ ذِى ٱلْجَلَـٰلِ وَٱلْإِكْرَامِ
Blessed is the name of your Lord, Owner of Majesty and Honor.
Translation: Saheeh International
Tafsir
Blessed be the Name of your Lord He of Majesty and Munificence as explained above; the word ism is extra.
Excerpt from Tafsir al-Jalalayn, commentary on 55:78, via Quran.com. The reader has the full commentary and 9 more tafsirs.