This is the 7863rd most frequent Swedish word.
valerij
"Valerij" is not a Swedish word; it is a Slavic male name, equivalent to "Valery" in English.
In this sentence, 'Valerij' is used as a proper noun, referring to someone's name, specifically the subject of the sentence who performed the action of going to the park.
Valerij gick till parken idag.
Valerij went to the park today.
Here, 'Valerij' is used as a proper noun, addressing a historical or fictional person mentioned in the context of a legend.
Det finns en berömd legend om Valerij.
There is a famous legend about Valerij.
In this instance, 'Valerij' serves as a proper noun, standing for the name of an individual who was encountered during the described event.