Tanya or Tania is the Slavic hypocoristic of Tatiana.
It is commonly used as an independent given name in the English-speaking world.
Some people also claim that the popularity of "Tanya" in Anglophone world is due to Ukrainian emigrees to Canada, who escaped Ukraine during the Civil War of 1918-20.
Variants include Tania (Ukrainian,[1] Romanian[2]); Tanja (Bosnian/Croatian/Serbian, Norwegian, German, Danish, Estonian, Finnish, Dutch, Slovene and Macedonian);[1] Táňa (Czech); Tânia; (Portuguese); and Taanya (Levant and Indian subcontinent).
[2] As of 2010 it was the 237th most common name in the United States, according to namestatistics.com, which uses US Census data.