This is the 4635th most frequent Swedish word.
alberto
"Alberto" is not a Swedish word; it is typically a masculine given name of Spanish or Italian origin.
This sentence uses 'Alberto' as the name of a person being directly spoken about.
Kan du fråga Alberto om han kommer till festen?
Can you ask Alberto if he's coming to the party?
In this case, 'Alberto' is mentioned as the artist's name, again used as a proper noun.
Jag såg en tavla målad av Alberto.
I saw a painting made by Alberto.
Here, 'Alberto' is used as a proper noun referring to a person's name.