In modern English, zenith means "the highest point or state; peak" and in astronomy, refers to "the point in the sky vertically above a given position or observer" or "the highest point in the sky reached by a celestial body."
In the English-speaking world, this name has been in occasional use from the late 19th century onwards.
The sonnets of William Shakespeare, on the other hand, are typically three Sicilian quatrains, followed by an heroic couplet.
Other notable bearers include Owain the Great, a 12th-century king of Gwynedd, and Owain Glyndwr, a 14th-century leader of the Welsh resistance to English rule.
As a given name it was mostly masculine in America until around 2009. It was already rising in popularity for girls when singer Mariah Carey gave it to her daughter born 2011 (though this probably helped accelerate it).
According to tales first recorded in Old French in the 12th century, Yseut or Ysolt was an Irish princess betrothed to King Mark of Cornwall. After accidentally drinking a love potion, she became the lover of his nephew Tristan. Their tragic story, which was set in the Arthurian world, was popular during the Middle Ages and the name became relatively common in England at that time. It was rare by the 19th century, though some interest was generated by Richard Wagner's opera Tristan und Isolde (1865).
Gawain was a popular hero in medieval tales such as those by Chrétien de Troyes, where his name appears in the French form Gauvain or Gauvains. He is the main character of the 14th-century anonymous poem Sir Gawain and the Green Knight, in which he accepts a potentially fatal challenge from the mysterious Green Knight.