This is the 137th most frequent Azerbaijani word.
bakı
"Bakı" means "Baku," the capital city of Azerbaijan.
Here 'Bakı' is used as a proper noun referring to the capital city of Azerbaijan, and it takes a directional suffix ('ya') indicating motion towards it.
Mən Bakıya getdim.
I went to Baku.
In this sentence, 'Bakı' again refers to the city, but it takes an ablative suffix ('dan') indicating motion away from it.
Bakıdan sənə hədiyyə gətirmişəm.
I brought you a gift from Baku.
The word 'Bakı' in this sentence functions as the subject of the sentence, referring to the city and describing its beauty.