

The 99 most beautiful names in existence, the names of Allah -swt
"He is Allah, the Creator, the Originator, The Fashioner, to Him belong the most beautiful names: whatever is in the heavens and on earth, do declare His praises and glory. And He is the Exalted in Might, The Wise. -Quran 59:24
"The most beautiful names belong to God: so call on Him by them;..." -7:180
It is not possible to perfectly translate the names and attributes of Allah from their original Arabic into English. However, here are some fairly close explanations.
All the names of Allah (swt) are characteristics of Allah -swt
All the characteristics of Allah (swt) are not the names of Allah -swt
Allah
This is the ALLAH's proper name on which depends the existence and welfare of the entire universe
In the name of God,
the infinitely Compassionate and Merciful.
Praise be to God, Lord of all the worlds.
The Compassionate, the Merciful.
Ruler on the Day of Reckoning.
You alone do we worship,
and You alone do we ask for help.
Guide us on the straight path,
the path of those who have received your grace;
not the path of those who have brought down wrath,
nor of those who wander astray.
Amen.
Al-Fatiha 1, tr. Helminski
Ar-Rahman
The Beneficent, He who gives blessings and prosperity to all beings without showing disparity.
The Most Gracious has imparted this Qur'an unto man.
He has created man: He has imparted unto him articulate thought and speech.
At His behest the sun and the moon run their appointed courses; before Him prostrate themselves the stars and the trees.
And the skies has He raised high, and has devised for all things a measure, so that you too, O men, might never transgress the measure of what is right: weight, therefore, your deeds with equity, and cut not the measure short!
and the earth has He spread out for all living beings, with fruit thereon, and palm trees with sheathed clusters of dates, and grain growing tall on its stalks, and sweet-smelling plants.
Which, then, of your Sustainer's powers can you disavow?
Ar-Rahman 55:1-13, tr. Asad
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Ar-Rahim
The Merciful, He who gives blessings and prosperity, particularly to those who use these gifts as Allah has said, and is merciful to the believers in the hereafter.
Bismillah ar-Rahman ar-Rahim
In the name of God, the infinitely Compassionate and Merciful
Al-Fatihah 1:1, tr. Helminski