In every one2many relationship field there is a many2one field in the other side of the relation, so you should have in Model 2 a many2one field to Model 1. To display the name of Model 1 in a form view of Model 2 you need to declare the name as a related field in Model 2 class definition, something like this:

class model1(osv.osv):
    _name = 'model1'
    
    _columns = {
        'name': fields.char('Name', size=64, required=True),
        'model2_ids': fields.one2many('model2', 'model1_id', string='Models 2'),
    }
model1()

class model2(osv.osv):
    _name = 'model2'
    
    _columns = {
        'name': fields.char('Name', size=64, required=True),
        'model1_id': fields.many2one('model1', string='Model 1'),
        'name_rel': fields.related('model1_id', 'name', type='char', string='Model 1 Name')
    }
model2()    

Then in your view of Model 2 just add 

<field name="name_rel"/>

try to use this

from odoo import models, fields, api


class MyModel(models.Model):
    _name = "my.model"

    another_model_ids = fields.One2Many(
        comodel_name="another.model", inverse="my_model_id",
        string="Another Model Entries")


class AnotherModel(models.Model):
    _name = "another.model"

    my_model_id = fields.Many2One(
        comodel_name="my.model", string="My Model")
    number = fields.Integer(string="A Number")
    yet_another_model_id = fields.Many2One(
        comodel_name="yet.another.model", string="Yet Another Model")

    @api.multi
    def name_get(self):
        # with context flags you can implement multiple
        # possibilities of name generation
        # best example: res.partner
        res = []
        for another_model in self:
            res.append((another_model.id, "{} {}".format(
                another_model.number,
                another_model.yet_another_model_id.name)))
        return res


class YetAnotherModel(models.Model):
    _name = "yet.another.model"

    name = fields.Char(string="Name")

Try something like <span t-field="o.mod1_id.name">, where "mod1_id" is the name of your relation field to Model 1.