Israعصرا
Travel by night, The first stage in Miraj [Ascension of the Holy Prophet Muhammad (pbuh) to heaven], in which the Prophet was taken to the Remote Mosque (Masjid al-Aqsa), or the Temple at Jerusalem
Istakhriاستخر
A Shafaee jurist, Abu Saeed Al-Hasan had this name.
Istibsharاستبشر
Istibshar is an Arabic name for boys and girls that means to become happy, to become hopeful. It also means to have hope, to receive good tidings.
Istifaاصطفى
To choose, to prefer, to give prefer to one over the other.
Istiqlalإستقلال
Istiqlal is an indirect Quranic name for boys and girls that means independence, sovereignty. It is used when speaking of countries.