I’m struck by how many Zemblans (and Zemblan places) contain clockfaced letter O’s in their names. Noes and reverse-noes abound.
There’s Aros, Boscobel, Grindelwod, Kronberg, Odevalla, Onhava, Rippleson Caves, Yeslove, Hodinski / Hodyna, King Igor II, the Shadows, Yonny, Conmal (Duke of Aros), Count and Countess Otar, Romulus Arnor, Kinbote, Harfar, Baron of Shalksbore, Odon / Odonello, Nodo / Nodon, Oleg (Duke of Rahl), Oswin Bretwit, Baron Oswin Affenpin, Baron Mirador Mandevil, Colonel Montacute, Rippleson, Izumrudov, Thormodus Torfaeus and Kinbote. (Disa appears to be an exception until we remember the O lurking in ‘Duchess of Payn and Mone’.) I’m sure there are others. I’m tempted to include Sudarg of Bokay / Yakob Gradus, Roman Tselovalnikov and Andronnikov but they’re not Zemblan.
Things are different in New Wye: if we omit the three lakes that make a point of being zeros, few of its natives or places have nulls in their names. Certainly none of the main characters currently possess an O.
Most of the exceptions are foreigners, foreign-named locals or characters no longer residing in New Wye – eg Judge Goldsworth on sabbatical in England, Professor Vseslav Botkin, Dr Oscar Nattochdag, Sybil’s maiden name Irondelle (courtesy of her Canadian family, I believe), Starover Blue (named in memory of his Russian grandfather), Jane and Pete whom Kinbote ‘outs’ as Provost, now living in Chicago and Detroit, and the town of Exton on the south side of Omega lake – we’re left with two round-lettered Bobs (Kinbote’s ‘bad Bob’ and Mayor Bob Wells), three Colts (Old Doctor Colt, Mr and Mrs Dick Colt) and the librarian Milton Stone. I've undoubtedly missed some.
Characters who appear to straddle both Zembla and New Wye – like Sylvia O’Donnell – tend to possess at least one O, as do characters who mirror each other (the faunlet Gordon and Assistant Professor Misha Gordon, although the latter is presumably a foreigner).