Saudi Arabia
The official language of Saudi Arabia is Arabic. The three main regional variants spoken by Saudis are Hejazi Arabic (about 6 million speakers), Najdi Arabic (about 8 million speakers), and Gulf Arabic (about 0.2 million speakers). Saudi Sign Language is the principal language of the deaf community. The large expatriate communities also speak their own languages, the most numerous of which are Tagalog (700,000), Rohingya (400,000), Urdu (380,000), Egyptian Arabic (300,000), and Indonesian (250,000).
Sylheti language
1. Jalalabadi Sylheti: This dialect is mostly spoken in the Sylhet, Moulvibazar and Habiganj districts. It is heavily influenced by Arabic and Persian due to arrival of Islam in the region. Named after Shah Jalal, it is mostly spoken by the Muslim population although Hindus in these areas may also speak in this dialect. Covering most of the Sylhet region, there are slight differences in vocabulary which can still be seen although it is one dialect. This dialect is also viewed as the standard version of Sylheti.