How many Irregular verbs are there in the English language?
In commonly used English there are about 200 irregular verbs.
In total, including the not-so-commonly used and some antiquated verbs, there are well over 470 irregular verbs. Here's a link to the commonly used irregular verbs in English: https://en.wikipedia.org/wiki/English_irregular_verbs#List.
And here's a link to a more complete list with some more obscure words: https://en.wikipedia.org/wiki/List_of_English_irregular_verbs.