Hi,

Try the code below it may help you ,

from odoo import fields, models, api

class SaleOrderLine(models.Model):
    _inherit = 'sale.order.line'

    @api.depends('product_id')
    def _compute_name(self):
        res = super(SaleOrderLine, self)._compute_name()
        for line in self:
            if not line.product_id:
                return
            if line.product_id:
                line.name = line.product_id.brand_id.name
        return  res

Regards