Probably John or Bob.

Although Scotty would seem very appropriate? Or how about Peaty? Mr. Malt maybe?

Or if one is feeling somewhat mythological, Zeus, Thor, Hercules, or Apollo would work.

And for a slightly more fantasy like approach, Rumpelstilskin, Allanon (Shanarra series), or my little brother Grimm.

And if your sporran flask friend is female, then maybe Diana, Clytemnestra, Xena, Zenobia, or Desiree!