Arcana Coelestia #478
478. The reason he is called Adam is that the Hebrew word Adam means man. But the fact that Adam was never used as a proper name, only Man, is quite clear from the consideration that both here and earlier he is spoken of in the plural and not in the singular, and that the term refers to both man and woman. The two together are called Man. Anyone may see from these words that both are included, for it is said, 'He called their name Man on the day in which they were created', and similarly in 1:26, 28, 'Let Us make man in Our image, and they will have dominion over the fish of the sea. This shows also that the subject is not about someone who, when created, was the first human being of all, but about the Most Ancient Church.
Heaven and Hell #12
12. From these things it can now be established that the Lord dwells with the angels of heaven in what is His own, and thus that the Lord is the All in all things of heaven. The reason for this is that Good from the Lord is the Lord with the angels, for that which is from Him is Himself. Similarly it is plain that it is Good from the Lord which is heaven for the angels, and not anything of their proprium.