Read on to find out which languages fill out the top 20, along with some fascinating facts about them. English // 1.35 BillionThe most common word in the most common language is thought to be the. Mandarin Chinese // 1.12 BillionA bronze statue of a 16th-century Chinese official. Standard Arabic // 274 MillionOut of the six official languages of the United Nations, Arabic is the only one written from right to left. Korean // 82 MillionIn many situations where English speakers would use I or my, native Korean speakers would use uri, meaning we or our.