Definition of "first name"

first name

noun
plural first names
1. Synonym of given name, particularly when it forms the first element of a full name.
  Quotations
  Imagine a country where children do nothing but play until they start compulsory schooling at age seven. Then, without exception, they attend comprehensives until the age of 16. […] Children address teachers by their first names. Even 15-year-olds do no more than 30 minutes' homework a night.
  2013 July 19, Peter Wilby, “Finland spreads word on schools”, in The Guardian Weekly, volume 189, number 6, page 30