Question

What's the name of British flag

Answer 1

Union Jack
When the 'Union Jack' was first introduced in 1606, it was known simply as 'the British flag' or 'the flag of Britain', and was ordered to be flown at the main masthead of all ships, warships and merchant ships, of both England and Scotland. The first use of the name 'Union' appears in 1625

Answer 2

The name of the British flag is Union Jack