English.
The most commonly spoken language in the UK is English.
Spanish is the second most common "spoken" language. The second most common language is sign language.
Based on population, Chinese Mandarin is the most commonly spoken language in the world. Spanish is 2nd, followed by English and Bengali.
Welsh is the most commonly spoken Celtic language, about 90% of the speakers live in Wales and England. Irish is the second commonly spoken.
Russian is the most commonly spoken Language in Europe.
Portugeze is the most commonly spoken language in Brazil.
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Spanish is the most commonly spoken language in Central America, due to the region's history of Spanish colonization. It is the official language in all countries in Central America, with the exception of Belize where English is the official language.
Hebrew is the most commonly spoken language in Israel.
English.
Russian
Hebrew