You can change the names of your accounts in two ways:
1. 'Settings' > 'Bank access' > 'Connected Accounts' > 'Select account' > 'Change the name directly in the business card or under "Name"'
2. 'Accounts' > 'Account' > 'press the account name above the transaction list' > 'change the name at the top of the business card or under "Name"'