The way umlauts or often used in memes like this one, the authors seem not to be aware that they are pronounced differently than the corresponding vowel.
QI (Quite interesting BBC show) tweeted: The 'metal umlaut', as used in Motörhead or Mötley Crüe, is purely decorative and not intended to affect pronunciation. However, when Mötley Crüe first performed in Germany the crowd didn't know this and chanted 'Mutley Cruh! Mutley Cruh!'.
Apparently they were drinking Löwenbräu when they named the band.
It was on the show once but I can't find the clip, and I won't link to xitter so. You can find Tommy Lee verifying that tweet if you google "qi motley crue quite interesting"