This is the 3786th most frequent German word.
sainz
The word "sainz" does not exist in German. It might be a name or misspelling.
Here, 'Sainz' is used as a proper noun referring to the name of a person, specifically a racing driver.
Carlos Sainz ist ein talentierter Formel-1-Fahrer.
Carlos Sainz is a talented Formula 1 driver.
'Seins' in this sentence represents the genitive form of 'Sein,' which means 'being' in philosophical jargon.
Das Konzept des „Seins“ ist zentral in der Philosophie.
The concept of 'being' is central in philosophy.
This usage recognizes 'Sainz' as a surname common in Spanish-speaking communities.