How can i locate a lost MacBook under a different name but i was using it with my account?

Hi ApostleBBC,

Thanks for posting in Apple Support Communities.

You can locate your lost MacBook using Find My if it was signed in using your Apple ID. If it was singed in using a different Apple ID, the owner of that account would need to track it using Find My.

About locating a device

* You can use Find My on your Mac to see the location of your device on a map and play a sound on it to help you find it. If the device is online, you see the location of the device. If the device is offline, you see the location of the device the last time it went online or connected to the Find My network.

* For AirPods and supported Beats headphones, you can see their location and play a sound on them when they’re nearby your device and connected to Bluetooth. For supported AirPods, you can also see their location via the Find My network for up to 24 hours after they last connected to your device, even if they’re not nearby. See Turn on the Find My network in the AirPods User Guide.

* For a supported iPhone Wallet with MagSafe, you can see its location when it’s attached to your iPhone and its last known location if it detaches from your iPhone.

See the location of a device

1. In the Find My app  on your Mac, click Devices.

2. In the Devices list, select the device you want to locate.

* If the device can be located: It appears on the map so you can see where it is. The updated location and timestamp appear under the device’s name. If there’s a blue circle around the device, the location is approximate.

* If the device can’t be located: Below the device’s name, “No location found” appears. If you want to be notified when the location is available, click the Info button  on the map, then turn on Notify When Found. You receive a notification once it’s located.

* Important: Make sure you allow notifications for the Find My app. See Change Notifications settings on Mac.

For troubleshooting steps, see the Apple Support article If Find My is offline or not working.

Find these details and more in Locate a device in Find My on Mac - Apple Support.

Regards.