What is the biggest number with a name?

In Modern Day British, Austrailian and US language the biggest number with a name is "Unvigintillion" or 1 followed by 66 zeros.

However in very old British and Austrailian language it is still "Unvigintillion" but it refers to 1 followed by 126 zeros.

Source Wiktionary.

The 3rd biggest number with a name is a googol: a "1" followed by 100 zeros.

The 2nd biggest number with a name is a googolplex: a "1" followed by a googol zeroes.

The BIGGEST number in the world is a googolplexian: a "1" followed by a googolplex zeros.