Change Display Name of current user using REST API in SharePoint 2013

In one SharePoint 2013 portal, we had a requirement to change display name of current logged in User, which appears in Welcome Menu.

We had below script in master page, which successfully changed display name as First Name & Last Name.

_ spPageContextInfo.userId   will give user id in User Info List.

After that we can construct REST URL to access User Info List and retrieve User Details (First Name, Last Name, Department, Email etc.) using REST API.

.ms-core-menu-root CSS class gives User Display Name object and by using Jquery syntax below we can set name as per our requirement.

var userid = _spPageContextInfo.userId;

   var reqUrl = _spPageContextInfo.webAbsoluteUrl + "/_api/Web/SiteUserInfoList/Items("+ userid +")?$select=FirstName,LastName";

   var displayName ;

   

   

   $.ajax({

                url: reqUrl,

                type: "GET",

                headers: {

                    "accept": "application/json;odata=verbose",

               },

        success: function (data) { 

         $(".ms-core-menu-root")[1].innerText= data.d.FirstName + " " +  data.d.LastName;

                 },

        error: function (error) {

              alert("error in REST API call");

        }

       });