Rocket.Chat/client/notifications/UsersNameChanged.js

Meteor.startup(function() {
	RocketChat.Notifications.onLogged('Users:NameChanged', function({_id, name, username}) {
		RocketChat.models.Messages.update({
			'u._id': _id
		}, {
			$set: {
				'u.name': name
			}
		}, {
			multi: true
		});

		RocketChat.models.Messages.update({
			mentions: {
				$elemMatch: { _id }
			}
		}, {
			$set: {
				'mentions.$.name': name
			}
		}, {
			multi: true
		});

		RocketChat.models.Subscriptions.update({
			name: username,
			t: 'd'
		}, {
			$set: {
				fname: name
			}
		});
	});
});