Muita coisa você pode encontrar no google veja abaixo, código retirado do link https://stackoverflow.com/questions/484 ... eader?rq=1
Controller catalog/controller/common/header.php
Find: return $this->load->view('common/header', $data);
Add before it:
if($this->customer->isLogged()){
$data['text_customer_name'] = sprintf($this->language->get('text_customer_name'), $this->customer->getFirstName(), $this->customer->getLastName());
} else {
$data['text_customer_name'] = $this->language->get('text_account');
}
Language catalog/language/*/common/header.php
Add: $_['text_customer_name'] = 'Hi %s %s';
View catalog/view/theme/*/template/common/header.twig
Find: {{ text_account }}
Replace with: {{ text_customer_name }}