"Studies have revealed that about 400 words in English are incontestably Scandinavian in origin and are still in daily use in standard, literary English (Geipel, 1971, p.69). Although 400 words are a mere fraction of those 20,000-30,000 words it must be acknowledged that most of the ON terms left behind by the Vikings are the very bedrock of English lexicon and the most frequently occurring words in spoken English. Geipel also takes this further and states that if rural dialects are added the number goes quickly from 400 to 2,000 items, enough to allow a person to carry on a simple conversation using entirely ON terms."One of these words is "they" and its variations, which you probably use many times a day.
(H/t: Medievalists)
