Possible Clues:

• Baseball's Maris, for short
• Yankee Maris, informally
• Baseball's Maris, to pals
• Hitter Maris, for short
• Slugger Maris, to pals
• Maris, to 'the Mick'
• Maris, to "the Mick"
• Krivoy ___, Ukraine
• Critic Ebert, informally
• 'Mad Men' nickname