It’s not that they don’t have the same name; companions need not appear on the list at all. This happened to me a few weeks ago flying to OGG with my son (no status). I showed up at the top of the list, and my wife and daughter, both MVP at the time and on a separate PNR, showed up below. But my son was nowhere on the upgrade list or awaiting seats list at all. Based on previous experience I was concerned they wouldn’t process the upgrade or that they’d split my PNR. But when I called in they said it’s common for the companion not to appear on the list, and we both cleared into F at the gate around T-1.