Here are some names generated for a post-apocalyptic setting featuring strange sand and water creatures, abandoned cities, and towns:

City Names:

• Dustbowl Gulch
• Rusthaven
• Sunken Sands
• Scalding Shores
• Whispering Dunes
• The Murk
• Serpent's Spine
• Tide's End
• Cinderfall
• Saltwind
• Shadow Reef
• Coral Tomb
• The Drowned City
• Broken Spire
• Ember's Embrace

Town Names:

• Sandclaw
• Gilltown
• Driftwood
• Kelp's Hold
• Dune's Rest
• The Mire
• Scavenger's Row
• Mariner's Grave
• Ashfall
• Brine's End
• Wreckage Point
• Coral Hollow
• The Sunken Village
• Shattered Stone
• Ember's Kiss

Creature Names (Sand):

• Sand Stalkers
• Dune Crawlers
• Whispering Worms
• Sun Scorchers
• Razorbacks
• Dust Devils
• Shifting Sands
• Dune Lurkers
• Sand Serpents
• Silica Scuttlers

Creature Names (Water):

• Gill Fiends
• Kelp Crawlers
• Brine Beasts
• Tide Eaters
• Murk Lurkers
• Deep Ones
• Coral Claws
• Reef Stalkers
• Shadow Fish
• Siren's Call

Faction Names:

• The Sand Raiders
• The Tide Runners
• The Dune Dwellers
• The Murk Raiders
• The Kelp Clan
• The Sunken Brotherhood
• The Coral Guard
• The Ashwalkers
• The Saltwind Syndicate
• The Scavenger's Guild

Character Names:

• Jax "Sandstorm" Riley
• Seraphina "Tide" Moore
• Kael "Dune Walker" Thorne
• Lysandra "Murk" Blackwood
• Rhys "Kelp" Grey
• Zane "Ash" Stone
• Anya "Saltwind" Reed
• Orion "Coral" Hayes

These names aim to evoke the harsh, desolate environment and the unique creatures inhabiting it. They incorporate imagery of sand, water, decay, and the struggle for survival in this post-apocalyptic world. Remember that you can combine elements from different categories to create even more unique and evocative names.