English
No European languages can be considered "common" in Iran, but the most widely studied foreign language (after Arabic) is English, which is a European language.
The most commonly spoken language in the UK is English.
French is the most commonly spoken language in Paris. However, due to its diverse population, you may also hear other languages such as English, Arabic, Spanish, and various African languages spoken in the city.
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.
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.
The official language spoken in Brazil is Portuguese.
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Spanish is the second most commonly spoken language in the United States.
English.
Russian
English.