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Most of the pilots in Angels2200 are referred to by their callsign or last name.
Nicknames instead of first or last names are pretty common among enlisted troops of all services, especially to enforce a One Steve Limit if there's more than one soldier of the same last name and rank.
The title character of It's Walky! goes by Walkerton. He doesn't actually LIKE his nickname Walky (At best he tolerates it, there are only a few characters he actually doesn't mind calling him that). Almost no one calls him "David".
Bonus points because even his parents call him Walky.
All of the government-employed characters in Doomsday, My Dear refer to each other by last name: Zahra, Bowden, Young, et cetera. A few characters refer to Khepry and Chet by their first names, but no one uses Cyril's.