This is the 8319th most frequent Turkish word.
müller
The Turkish word "müller" does not have a meaning; it appears to be a German surname rather than a Turkish word.
Here, 'Müller' is used as a surname, identifying a family or a group of individuals related.
Müller Kardeşler bu dükkânı işletiyor.
The Müller Brothers run this shop.
In this context, 'müller' refers to repair professionals, likely surnamed Müller, performing the repair.
Bisikletim müller tarafından tamir edildi.
My bicycle was repaired by Müllers.
Here, 'Müller' is used as a business name, specifically a bakery named after possibly the owner or founder, Müller.