The first 12 people embraced Islam

 the people who embrace Islam are :

1) Siti khadijah binti khuwalid : wife of prophet muhammad.

2)Ali bin abi thalib : cousin of prophet muhammad.

3)Abu bakar as siddiq : friends of prophet muhammad.

4)Utsman bin aifan : son in law's of prophet muhammad.

5)Zubair bin awwam : warlord's of prophet muhammad.

6)Abdurrahman bin auf : friends of prophet muhammad. 

7)Sa'ad bin abi waqqas : friends of prophet muhammad who spread the teachings to china.

8)Thalhah bin ubaidillah : friends of prophet muhammad.

9)Abu ubaidah bin jarran : friends of prophet muhammad. 

10)Arqam bin abil arqam : friends of prophet muhammad.

11)ummu aiman :drink the urine of the Prophet muhammad.

12)Zaid bin haritsah : adopted son of the Messenger of God