As far as I know there is no Roman name for Achelois.
The dolphin
Crescent Moon
Achelois was a minor Greek moon goddess. She was frequently the recipient of sacrifices ordered by the Dodonian oracle, in order for her subjects to be cured of their ailments
Yes her husband was Ceyx
She was worshiped most frequently as the recipient of sacrifices ordered by the Dodonian Oracle; but as she was a moon goddess, she would be considered as the moon itself, or one of it's phases.
The cast of Dead Meadow Three Kings - 2010 includes: Porcelain Black Jimmy Brayl as Charybdis Monster Traci Conti as Achelois Sophie Hannah Steve Kille as Balthasar Samantha Mayfair Stephen McCarty as Gaspar Tatjana McElroy Ariana Papademetropoulos Sylvie Spencer as Charybdis
I don't know all the minor Greek Gods and Goddesses, but I do know a few. Achelois Achelous Aeolus Aether Alastor Alcyone Alectrona Amphitrite Antheia Aphaea Aristaeus Asclepius Bia Boreas Brizo Caerus Calypso Celaeno Ceto Chaos Charon Chronos Circe Clotho Cybele Dinlas Doris Eileithya Eireisone Eectra Elpis Eos Erebus Eris Eros Eurus Glaucus Harmonia Hebe Hecate Helios Hemera Heracles Hesperus Hygea Hymenaios Hypnos Iris Khione Kotys Lacheses Maia Mania Merope Momus Morpheus Nemesis Nereus Notus Nike Nyx Pallas Peitha Pheme Phosphorus Plutus Pontus Priapus Proteus Sterope Styx Taygete Thantos Themis Triton Tyche Zelus Zephyrus That is all I really know, but most I don't know what they represent. Hope this helps!
THE GODDESSES ACHELOIS Alcyone ALECTRONA AMPHITRITE ANTHEIA APATE APHAEA APHRODITE ARTEMIS ASTRAEA ATΓ ATHENA ATROPOS BIA BRIZO CALLIOPE CALYPSO CELAENO CETO CIRCE CLIO CLOTHO CYBELE DEMETER DORIS EILEITHYIA ELECTRA ELPIS ENYO EOS ERATO ERIS EUTERPE GAIA HARMONIA HEBE HECATE HEMERA HERA HESTIA HYGEA IRIS KERES KOTYS LACHESIS MAIA MANIA MELPOMENE MEROPE METIS NEMESIS NIKE NYX PEITHO PERSEPHONE PHEME POLYHYMNIA RHEA SELENE STEROPE STYX TAYGETE TERPSICHORE THALIA THE ERINNYES THE GRACES THEMIS THETIS TYCHE URANIA THE GODS Achelous AEOLUS AETHER ALASTOR APOLLO ARES ARISTAEUS ASCLEPIUS ATLAS ATTIS BOREAS CAERUS CASTOR CERUS CHAOS CHARON CRONOS CRIOS CRONUS DINLAS DEIMOS DIONYSUS EREBUS EROS EURUS GLAUCUS HADES HELIOS HEPHAESTUS HERACLES HERMES HESPERUS HYMENAIOS HYPNOS KRATOS MOMUS MORPHEUS NEREUS NOTUS OCEANUS ONEIROI PAEAN PALLAS PAN PHOSPHORUS PLUTUS POLLUX PONTUS POSEIDON PRIAPU PRICUS PROMETHEUS TARTARUS THANATOS TRITON TYPHON URANUS ZELUS ZEPHYRUS ZEUS