Leonardo da Vinci did not have a wife and kids. But his closet relationship was with two of pupils. The relationship was known to be in a sexual nature. Da Vinci and 3 other men were charge with sodomy but later acquitted. From then Leonardo was presumed homosexual.
Yes that's why he was called Leonarda da Vinci, the literal translation is Leonardo of Vinci, he didn't have a surname when he was born so he was called Leonardo di ser Piero da Vinci (Leonardo son of Piero of Vinci) which was later shortened to Leonardo da Vinci.