If Americans call an aeroplane an airplane, why aren't the American rock band Aerosmith called Airsmith?

If the word is spelled "lieutenent" why do the British say "leftenant"? Makes them sound like Continentals, but to be fair they may as well be. A whopping 30 or so kilometers away from France and they act like they live in Atlantis. XD

The band named themselves...

Just like colour and color, realise and realize...we spell differently for some reason.🤔

The band members can spell.

dude