It's uncertain when the change occurred, but the Way back Machine shows that Cook was using his full name on Twitter as of March 6. Cook changed his last name on the social platform for the Apple logo emoji.
Trump just called Apple CEO Tim Cook “Tim Apple” pic.twitter.com/gTHHtjWvc9— Sean O'Kane (@sokane1) March 6, 2019
Check out the reactions:
Tim Apple, Satya Microsoft and Jeff AmazonWashingtonPost when they received their new names. pic.twitter.com/ReCYwCuNZ7— ian bremmer (@ianbremmer) March 7, 2019
This is literally the first time Chrome and Android users consider switching platforms. pic.twitter.com/EVzkJWcIS9— Mike Bush (@mikebush) March 7, 2019
Woah there! Easy tiger. Let's not go overboard. ????— Mike Goodwin (@Goodo73) March 7, 2019
Tim *apple crashing emoji*— Dennis van Rijssen (@rijssen_dennis) March 7, 2019