Laudator Temporis Acti

Valerius Maximus, Memorable Doings and Sayings 7.7.6,tr. D.R. Shackleton Bailey, with his note and critical apparatus, from his Loeb Classical Library edition of Valerius Maximus (Cambridge: Harvard University Press, 2000), pp. 176-179 (I've placed the English before the Latin):

A certain Genucius, a eunuch priest of the Great Mother, had obtained an order from City Praetor Cn. Orestes restoring to him the property of Naevius Anus, of which he had received possession from the Praetor himself according to the will. Surdinus, whose freedman had made Genucius his heir, appealed to Mamercus, who cancelled the Praetor's ruling, saying that Genucius, whose genital parts had been amputated by his own choice, should not be reckoned among either men or women. A judgment appropriate to a Mamercus,⁷ appropriate to a Leader of the Senate; it provided that magistrates' tribunals should not be defiled by Genucius' obscene presence and tainted voice under the pretext of seeking justice.

⁷ Archaic form of Marcus, redolent of old-time manners, perhaps assumed by himself.

Quid? Mamerci Aemilii Lepidi consulis quam grave decretum! Genucius quidam, Matris Magnae Gallus, a Cn. Oreste praetore urbano impetraverat ut restitui se in bona Naevii Ani⁷⁶ iuberet, quorum possessionem secundum tabulas testamenti ab ipso acceperat. appellatus Mamercus a Surdino, cuius libertus Genucium heredem fecerat, praetoriam iurisdictionem abrogavit, quod diceret Genucium amputatis sua⁷⁷ ipsius sponte genitalibus corporis partibus neque virorum neque mulierum numero haberi debere. conveniens Mamerco, conveniens principi senatus decretum, quo provisum est ne obscena Genucii praesentia inquinataque voce tribunalia magistratuum sub specie petiti iuris polluerentur.

76 Naevii Anii A corr.: Naeviani AL

77 sua Heraeus: sui AL

Critical apparatus from John Briscoe's Teubner edition (Vol. II, p. 487): D.R. Shackleton Bailey, "Textual Notes on Lesser Latin Historians," Harvard Studies in Classical Philology 85 (1981) 155-184 (at 167):

7.7.6 ut restitui se in bona Naevi Ani iuberet

avi Kraffert. The cognomen "Anius," supported by Paris (Naevio Anio), has been much suspected (e.g. Münzer in RE XVI.1568 says it looks doubtful). To my explanation in Two Studies in Roman Nomenclature, p. 10, add that there is no need to write Anni. The spelling with one n is the older (in 4.6.1 the Bernensis [A] has anius corrected to annius).

Unless he changed his mind between 1981 and 2000, why did Shackleton Bailey in his Loeb translation print "Naevius Anus," instead of "Naevius Anius"?

Is the name Anius or Anus? In favor of the latter, see Thesaurus Linguae Latinae 2:200 (which, however, only cites inscriptional evidence, not Valerius Maximus 7.7.6):

Anus mul. certe cogn. CORP. X 3922 Satellia M. f. Anus. II 1476 Sulpicia L. f. Anus. II 2130 Cornelia L. f. Anus soror. 3513 Vergilia Q. f. Anus. dubium an appellativum: II 2240. V 4178. XII 4713. V.
Anus,-ī nom. vir. Hispanum. CORP. II 2719 Q. Cae. Ano filio. Otto.

See also Iiro Kajanto, The Latin Cognomina (Helsinki: Societas Scientiarum Fennica, 1965 = Commentationes Humanarum Litterarum, XXXVI.2), p. 301 (from Chapter 9: "Cognomina Relating to Age," under the heading "old age"—Latin anus means old woman):

Anus (f.) CIL seven, mostly of the type of SVLPICIA L.F. ANVS (II 1476), appellative? but cf. XII 4713 COELIA ANVS L. TRYPHERA
Anicilla II 3361; dim. of anus, cf. gent.
Anilla ILG 52; dim. of anus, once found in Macrob.
Anucella VIII 2890. 7694, 13 (Numidia); cf. Anucla 19215; dim. of anus
Anullus/la Afr. one man, four women; from anus? anulla once recorded in thes.
Anul(l)inus SEN. four; CIL seven men, two women; cf. gent.

Note that Kajanto also neglects the passage from Valerius Maximus.

Francis X. Ryan, Rank and Participation in the Roman Senate (Stuttgart: Franz Steiner Verlag, 1998), p. 307, argues that the man's name was actually Naevianus:

The urban praetor of 77, Cn. Aufidius Orestes, had granted to a certain Genucius possessio of the goods of one Naevianus, a freedman of a Naevius Surdinus.⁹⁷

97 The libertus was somehow overlooked by Treggiari. C. Kempf (Leipzig 1888) prints bona Naevi Ani and records in his apparatus "naevi ani" (LA¹), "naevii anii" (A²), and the conjecture "Naeviana" (Perizonius). Shackleton Bailey (1991, 8) ingeniously explains Ani as the praenomen "Annius," but this is more clever than convincing; if ingenious explanations are to be admitted, we may interpret Ani as the abbreviation for the tribe Aniensis. Presumably we are not dealing with two nomina: Treggiari (1969, 251) thought the freedman at Suet. Gram. 5 was named "Saevius Nicanor Postumius," but the text itself plainly reads duplici cognomine, and the man in question probably was a Sevius Pothus or Postumianus; cf. Kaster 1995. 110. Fabre (1981, 403) indexes the freedman as "Naevius Anus (?)"; if Ani stood alone in the text, it could acceptably be interpreted as a cognomen. The heir is named by nomen alone and the patron by cognomen alone, so one name should suffice for the testator. That the decedent had been adopted by another freedman (or made an heir on the condition of assuming his name) is not improbable, since his estate was large enough to precipitate a struggle, but even in the absence of a reason to suspect adoption it would be perverse to take "naevi ani" to signify any name other than "Naevianus."