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Casper is a proper name, most famously attached to the friendly ghost from mid-century American cartoons. That's almost certainly where the name came from. The ghost connection points in a consistent direction.

Something soft, unthreatening, maybe a little playful. Not clinical, not medical, not the language of orthopedics. Whether the founders picked it for that reason or just liked the sound isn't on record, but the associations land the same way either way.

It's a name that feels more like a character than a product, which is a different move than most of this category makes.

Casper starts hard and ends soft, a snapping K sound followed by two loose, sleepy syllables. That first hit gives the word some grip on the way in, which matters for a mattress brand trying to stand out from names like Purple or Nectar that soften from the first letter. There's also the ghost hiding in plain sight.

Most people meet this word first as a cartoon ghost's name, and that association arrives before any mattress meaning does. It's an odd thing to inherit for a company selling sleep, since a friendly ghost is also, technically, something that visits you at night. Nothing about the spelling causes trouble, and there's no real pronunciation puzzle here.

The interesting part is entirely in what the word already meant before this brand claimed it.

Weighing a purchase big enough to stall on for two years, this buyer balked at every option that required either a showroom visit or a leap of faith on something pricey they couldn't try first. Casper made the decision feel lower-stakes, the 100-night trial being the thing that finally moved them off the fence. This is a shopper who does moderate research, reads a few Reddit threads, and wants someone to have already figured out the tradeoffs for them.

They're not chasing specs. They want to buy the thing and stop thinking about it.

The mattress category is full of names that sound like industrial products. Sealy.