This is the 5422nd most frequent Dutch word.
leonard
The Dutch word "leonard" does not have a specific meaning; it is generally used as a proper noun, typically a name.
In this sentence, 'Leonard' is used as a proper noun, referring to a specific individual by name.
Leonard is mijn beste vriend.
Leonard is my best friend.
Here, 'Leonard' indicates ownership, suggesting that the painting in question was created by or belongs to Leonard.
Heb je het schilderij van Leonard al gezien?
Have you already seen Leonard's painting?
In this context, 'Leonard' is again used in a possessive sense, linking him to the cat as its owner.