This is the 2574th most frequent French word.
jair
"Jair" is not a French word. It may be a typo or proper name.
The word 'j'ai' is a contraction of 'je' (I) and 'ai' (have) and is used here to convey possession and necessity.
J'ai besoin d'un crayon pour écrire.
I need a pencil to write.
In this context, 'j'ai' follows the auxiliary verb 'have' used in forming the past tense, with 'ouvrir' (to open) as the past participle.
J'ai ouvert la porte pour entrer.
I opened the door to enter.
Here, 'j'ai' introduces the past action using 'voir' (to see) in its past participle to describe the completed action.