This is the 1415th most frequent Arabic word.
سيرغي
"سيرغي" is a transliteration of the name "Sergey," a common male given name of Russian origin.
In this sentence, 'سيرغي' is a proper noun, referring to a person's name.
سمع سيرغي الخبر السعيد.
Sergey heard the happy news.
Here, 'سيرغي' again is used as a proper noun representing a name, indicated to be the person performing the action.
ساق سيرغي السيارة بسرعة.
Sergey drove the car quickly.
In this context, 'سيرغي' still functions as a proper noun identifying the subject of the sentence.