We will probably never know that. Most likely it was some person trying to go from one place to another, or just fishing. Solo-sailing is not something earth-shattering, historically-speaking. Perhaps you are asking about the first person to make a substantial solo voyage - like circumnavigation? If you are really interested in things like this, find some books about Francis Chichester.
1895
the first person to sail the sea was christopher columbas
Ferdinand Magellan got the credit for that. But the first man to do it SOLO was Joshua Slocum, back at the turn of the 20th century, in the "Spray."
Dee caffari
Gil Eanes was the first person to sail beyond Cape Bojador.
He set sail in 1895, and returned more than 3 years later in 1898.
Yes Peter the great was the first person to sail through the strait.
No magellan was the first person to sail around the globe.
Magellan was the first person to sail all the way around the world!
Wiley Post.Wiley Post in 1933.
It was Native Americans.
The first person to fly solo across the Pacific Ocean. She was also the second person and first woman to fly solo across the Atlantic Ocean.