I can never remember if the words "Marcan" and "Lucan" are spelled with 'c' or 'k'.
Thankfully, for situations like this, there is GoogleFight.
Fight 1: Markan vs. Marcan.
Results: 755,000 to 3,520,000. "Marcan" wins!
Fight 2: Lukan vs. Lucan.
Results: 267,000 to 1,960,000. "Lucan" wins!