This person in hospital sent up labels

• April, May and June, for example
• Directory listing
• See 41-Across
• Andrea, Carla and Michael
• Phone-book listings
• Peter, Paul and Mary
• Onomastician's study
• They're often called out in alphabetical order in a roll call
• Directory listings

Wiktionary Word definitions in Wiktionary
n. (plural of name English) vb. (en-third-person singular of: name )