|A little too familiar? Via OrobosArt|
You could make up your own names. Or you could take a tip from Gene Wolfe, classical scholar and fantasy author. In the Long Sun series he presents a far-future society that worships machine intelligences who present themselves as Olympian gods but under their lesser-known historical epithets; so, for example, Aphrodite/Venus goes by "Kypris." In the Latro trilogy he goes back to the times of ancient Greece, but the narrator is an amnesiac Latin mercenary who breaks the familiar associations by translating the literal meanings of place and god names; so instead of "Sparta" we have "rope" and "Demeter" becomes the "Earth Mother."
Below is a list of the most evocative Olympian aliases and epithets. Good resources for this are Wikipedia and the terrific classical reference, theoi.com. For more variety, I've added some of the equivalences the Romans drew between their gods and the Etruscan and Celtic pantheons.
Aphrodite (Venus): the Cytherean, Cypris, Urania ("the heavenly"), Pandemos (as indiscriminate lover), "laughter-loving," "foam-born," "mother of desire". Etruscan: Turan.
Apollo: Phoebus (light), Loxias ("the obscure"; prophecy), the Musagete (arts), Acesius (healer), Apotropaeus (warder of evil), Pythios (dragon-slayer), Aphetor (archer). Etruscan: Aplu. Celtic: Belinus, Cunomaglus, Vindonnus.
Ares (Mars): Enyalius, Mamertus, Ultor, Theritas (the brute), "destroyer of men," "stormer of walls." Celtic: Albiorix, Alator, Camulos.
Artemis (Diana): Cynthia, Phoebe, Amarynthia, Aeginaea, Caryatis, "mistress of animals," Lochias (childbirth), Agrotera (countryside). Etruscan: Artumne. Celtic: Arduinna.
Athena: Pallas, Cydonia, Tritogeneia, "grey-eyed," "owl-eyed," Partheneia (virgin), Polias (cities), Phronesis (reasoning), Promachos (first to fight). Celtic: Brigantia, Sulis.
Demeter (Ceres): Thesmophoros ("order-bringer", natural law), Aganippe ("terrible mare"), "fruit-bringer", Chloe ("green"), Agaue (venerable), Chthonia (earth).
Dionysus (Bacchus): Iacchus, Liber, Sabazius, "The Liberator," Melanaigis ("black goatskin"), Lycurgus ("wolf-bane"), Polygethes ("many joys"), Omestes ("eater of raw flesh"), "destroyer of men." Etruscan: Fufluns.
Hades (Pluto): "the unseen," "the wealthy one," Polydegmon ("host to many"), Aidoneus (underworld). Etruscan: Aita.
Hera (Juno): "white-armed," "queen," "cow-eyed," Zygia (marriage), Gamelios (weddings). Etruscan: Uni.
Hermes (Mercury): Argeiphontes, Logios (orator), Psychopompos (guide of the dead), "ready helper," "luckbringer," Mercator (merchant). Etruscan: Turms (as seen in Grognardia). Celtic: Lugus.
Poseidon (Neptune): Soter (savior of mariners), Taureos (bull of the sea), "earthshaker". Etruscan: Nethuns.
Zeus (Jupiter): Ombrios (rain god), Agetor (leader), Panergetos ("all-doing"), Dikephoros ("justice-bringer"), Fulgens (lightning), Tonans (thunder), Optimus Maximus (best and greatest). Etruscan: Tinia. Celtic: Taranis.