Toby
Belch is the name of a character in Twelfth Night, Sir Toby Belch. But belch meant then what it means now. The name was intended to suggest the kind of man who drinks to excess and burps. Sir Toby does this in fact in the play, covering it up with "A plague o' these pickled herring!" Nobody is fooled, however: they know that booze and not pickled herring is at fault.
Antonio
The heroine of 'Twelfth Night' is most commonly considered to be Viola who valiantly disguises herself as a boy, Cesario in order to survive in a new land.
Well, the actual name is "Twelfth Night", and the title refers to the twelfth night after Christmas, traditionally a night of feasting, gifts, games and other festivities in old England.
The author. We have every reason to believe that Shakespeare gave it that name. It has another name, "What You Will". Some people had speculated that this was the original name of the play, but that someone else premiered a play called "What You Will" at the same time, and in order to distinguish them, Shakespeare called this one Twelfth Night, possibly because it was being premiered at Christmas time.
Cesario is the name Viola takes when she is disguised as a boy.
Twelfth Night (Epiphany)
There are numerous references to Jove in Twelfth Night - Jove is an alternative name for the ancient Roman God, Jupiter. The play is set in Illyria, on the Adriatic coast, which was part of the ancient Roman Empire.
Twelfth Night
It isn't known but there was another play at the same time called "What You Will". It's possible that Shakespeare may have wanted to call this one "What You Will" but didn't want to get them confused. So possibly his play was opening on Twelfth Night, so he used that for the name.
i think he wrote it because it was at theChristmas period and he wanted something festive. it would be a bit of Christmas entertainment. also calling it twelfth night instantly suggests that it is going to be about Christmas.
The Comedy of Errors is about two sets of identical twins. Twelfth Night is also about twins.