This is the 7296th most frequent Swedish word.
selwyn
"Selwyn" is not a Swedish word; it is typically a proper name in English.
The word 'Selwyn' is used as a proper noun, specifically a name.
Selwyn är min vän som bor i Sverige.
Selwyn is my friend who lives in Sweden.
Here, 'Selwyn' is part of a possessive form in a title, referring to the adventures belonging to someone or a character named Selwyn.
Vi tittade på 'Selwyn's äventyr' på TV igår.
We watched 'Selwyn's adventures' on TV yesterday.
In this sentence, 'Selwyn' is again used as a proper noun referring to a named entity or person.