This is the 7719th most frequent French word.
saastamoinen
"Saastamoinen" is not a French word; it is a Finnish surname.
The word 'Saastamoinen' is treated as a family name in this context.
Saastamoinen est un nom de famille finlandais bien connu.
Saastamoinen is a well-known Finnish surname.
The word 'Saastamoinen' refers to a proper noun associated with a museum in this sentence.
Le musée Saastamoinen à Helsinki présente des œuvres contemporaines.
The Saastamoinen museum in Helsinki features contemporary works.
Here, 'Saastamoinen' is again used as a proper name for an individual.