بِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ
Here ar-rahmaan would be Allah’s womb like protection for his servant in 17/1 , taking him from masjid al-haram to the frontier of the system to witness signs.
قُلِ ادْعُوا اللَّهَ أَوِ ادْعُوا الرَّحْمَنَ أَيًّا مَا تَدْعُوا فَلَهُ الأَسْمَاءُ الْحُسْنَى وَلا تَجْهَرْ بِصَلاتِكَ وَلا تُخَافِتْ بِهَا وَابْتَغِ بَيْنَ ذَلِكَ سَبِيلا
Here ar-rahmaan is seen to be the name second only to Allah since we are to invoke Allah or ar-rahmaan. All the other beautiful names are mentioned separate from this. Ar-rahmaan here refers to 17/105-109 which is the reception of Quran and the submission to its revelation upon us. Once again, ar-rahmaan is very personal to the Reader.