Helen vs Lena

Helen

name
  • A female given name from Ancient Greek. 

  • the daughter of Zeus and Leda, considered to be the most beautiful woman in the world; her abduction by Paris brought about the Trojan War. 

noun
  • Any of various papilionid butterflies of the genus Papilio. 

Lena

name
  • A female given name from Ancient Greek. 

  • A municipality in Asturias, Spain. 

  • A major river in Russia, flowing 2,734 miles from the mountains by the lake Baikal to the Arctic Ocean. 

  • A river in Trøndelag, Norway 

How often have the words Helen and Lena occurred in a corpus of books? (source: Google Ngram Viewer )