This is the 8065th most frequent Portuguese word.
sergei
The word "sergei" is not a standard Portuguese word; it is likely a proper noun, such as a name.
Here, the name 'Sergei' refers to a person's proper name, used as the subject of the sentence.
Sergei sempre gostou de estudar química.
Sergei always liked studying chemistry.
In this sentence, 'Sergei' acts as a proper noun, specifying a name and indicating cultural relevance.
O nome Sergei é popular na Rússia.
The name Sergei is popular in Russia.
Here, 'Sergei' is used as a potential nickname or pseudonym, emphasizing its applicability in a specific context.