Get the name of the collided object

Thanks in advance for reading

I'm using linecast to detect collision. The point is i need to know the name of the object I'm colliding with. So i have four empty game object around my player with linecasts from the player to these points and I can't seem to access the name of the collided object. Here's the code

using UnityEngine; using System.Collections;

public class collisiondetection : MonoBehaviour {

 public RaycastHit2D collidedTop;
 public RaycastHit2D collidedBot;
 public RaycastHit2D collidedRight;
 public RaycastHit2D collidedLeft;
 public Transform collisionCheckRight;
 public Transform collisionCheckLeft;
 public Transform collisionCheckTop;
 public Transform collisionCheckBot;

 public Transform textboxprefab;
 bool textbox;
 public MovementScript movementscript;
 // Use this for initialization
 void Start () {
     movementscript = GameObject.FindGameObjectWithTag("Player").GetComponent<MovementScript>();
 }


 // Update is called once per frame
 void Update () 
 {

     collidedTop = Physics2D.Linecast(transform.position, collisionCheckTop.position, 1 << LayerMask.NameToLayer("Obstacles"));
     collidedBot = Physics2D.Linecast(transform.position, collisionCheckBot.position, 1 << LayerMask.NameToLayer("Obstacles"));
     collidedRight = Physics2D.Linecast(transform.position, collisionCheckRight.position, 1 << LayerMask.NameToLayer("Obstacles"));
     collidedLeft = Physics2D.Linecast(transform.position, collisionCheckLeft.position, 1 << LayerMask.NameToLayer("Obstacles"));


 
 }

}

Any idea how i can get the object name?