This is the 6884th most frequent Turkish word.
burhanettin
"Burhanettin" is a Turkish male given name derived from Arabic, meaning "proof of religion."
In this sentence, 'Burhanettin' is used as a proper noun representing a person's name.
Burhanettin işe gitmedi bugün.
Burhanettin did not go to work today.
Here, 'Burhanettin' is still a proper noun, and the genitive suffix '-in' indicates possession, meaning 'Burhanettin's'.
Burhanettin'in başarılarını kutladık.
We celebrated Burhanettin's achievements.
In this context, 'Burhanettin' is a representation of a common name that might appear in traditional references.