This is the 11851st most frequent German word.
thierry
"Thierry" is not a German word; it is a French-origin given name.
In this sentence, 'Thierry' is the object of the verb 'getroffen' (met).
Ich habe Thierry gestern auf dem Markt getroffen.
I met Thierry at the market yesterday.
Here, 'Thierry' is used as a proper noun, functioning as the subject of the sentence.
Thierry ist ein begabter Künstler.
Thierry is a talented artist.
'Thierry' is used as a possessive noun, indicating that the portrait belongs to Thierry.