This is the 395th most frequent Estonian word.
tänak
"Tänak" is a surname in Estonian and does not have a standard dictionary definition in English.
Here, 'Tänak' appears in possessive form anyway, associated with an achievement.
Sel nädalal rääkisin Tänaku uusimast võidust.
This week I talked about Tänak’s latest victory.
In this sentence, 'tänak' is modified to its plural possessive form, indicating ownership of ideas.
Õpilased tænäkut tegevusest tos isu.
The students thanked for being full of ideas.
Here, 'Tänak' is a proper noun, referring to the name of a person.