This is the 8989th most frequent Russian word.
рахматулла
"Рахматулла" is not originally Russian; it is an Islamic/Arabic term meaning "mercy of Allah."
Here, 'Рахматулла' identifies a person by their name.
На улице я встретил человека по имени Рахматулла.
On the street, I met a person named Rakhmatulla.
In this sentence, 'Рахматулла' is used as a proper name, referring to an individual.
Рахматулла часто посещает свою семью в деревне.
Rakhmatulla often visits his family in the village.
'Рахматулла' is a proper noun here, possibly symbolizing a concept or another metaphorical usage.