This is the 6254th most frequent French word.
frederik
"Frederik" is not a French word; it is a proper noun, typically a given name.
In this sentence, 'Frederik' is used as a proper noun to refer to a person by their name.
Frederik est allé au marché ce matin.
Frederik went to the market this morning.
Here, 'Frederik' is again used as a proper noun, indicating an individual the speakers met.
Nous avons rencontré Frederik lors de notre voyage à Paris.
We met Frederik during our trip to Paris.
In this example, 'Frederik' is used as a form of address to directly involve Frederik in the conversation.