1999, Ellen Titlebaum, Sabrina Down Under, Archway (1999), ISBN 0671047523, page 32:"I don't know. But he's still breathing, or whatever it is merguys do. We've got to try and revive him somehow," said Sabrina thoughtfully.
2012, Zoraida Cordova, The Vicious Deep, Sourcebooks Fire (2012), ISBN 9781402265112, unnumbered page:Step right up and see the merboy, merguy, merman. Where does his ding-dong go?
2012, Suzanne Johnson, River Road, Tor (2012), ISBN 9780765327802, unnumbered page:“Here, entertain yourself. I'm only expecting merguys to be at the meeting today, and there are no pictures of them.†Either the male mers didn't get out much or, more likely, men had written all the history books.
