Apocalypse Explained #383
383. His name was Death, and Hell followed with him. That this signifies eternal damnation, appears from the signification of name, as denoting the quality of a thing (concerning which see above, n. 102, 148); here, the quality of the Word, [with those] who are in evils and the falsities thence; from the signification of death as denoting damnation (concerning which also see above, n. 186), for spiritual death is nothing else; from the signification of hell, as denoting evil and the falsity thence, because in these and from these hell exists. Furthermore, by hell is signified the same as by death, namely, damnation, but because both are here mentioned, and thus [hell] is distinguished from Death, by hell is signified eternal damnation; for those who come into hell remain there to eternity; therefore it is also said, "and Hell followed with him," to follow with him signifying to abide therein, namely, in damnation to eternity. From these considerations it is evident that by "his name was Death, and Hell followed with him," is signified eternal damnation.
Arcana Coelestia #3237
3237. 'And her name was Keturah' means the essence of this Divine Truth. This is clear from the meaning of the word 'name' as the essential nature, and of 'calling by name' as knowing the essential nature, dealt with in 144, 145, 1754, 1896, 2009. Now because one does not speak of the nature of what is Divine but of the Esse of this, 'name' here means the essence, indeed the essence of Divine Truth - Divine Truth being meant here by 'the wife', to whom 'her' refers. For here 'the wife' means Divine Truth, see just above in 3236. From this it is evident what 'Keturah' in general embodies.