Select a random element from an array

I am trying to select a random element from my array.

However, sometimes I am getting an index out of bounds error, even though I accounted for the array starting at 0 by adding 1 to the maximum value of the index.

from random import randint

names = ['Sam', 'Paul', 'Mark', 'Simon', 'Sean', 'Samantha', 'Ellen']
random_name = names[randint(0, len(array)+1)]

print(random_name)

I only get an index out of bounds error sometimes?