“Coin” is simply one card to replace all the credit cards, bank cards, et al in your wallet. It’s linked to your smartphone via Bluetooth so you can manage all the particulars including security.
The name is iconic, definitive, memorable, viral, a deep well for marketing & advertising, lends itself to endless wordplay in the press / Twittersphere, etc.
Most remarkably it is a name that came to be even though the company could not acquire Coin.com. They did it anyway.
Coin realized that the name was too important to have it be decided by dotcom availability – they reside at onlycoin.com, which won’t hurt them one bit.
Had they bought into the ridiculous herd mentality that it’s better to have a lesser name as long as it matches the dotcom address we would instead be reviewing a marketing, branding & advertising albatross like Coinly or Coinify or Coinacopia or LoinCoin. Or worse.