
gängig
common
Widespread, usual, or generally known and accepted.
Das ist die gängige Vorgehensweise in solchen Fällen.
That is the common procedure in such cases.
common / movable
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common
Widespread, usual, or generally known and accepted.
Das ist die gängige Vorgehensweise in solchen Fällen.
That is the common procedure in such cases.

movable
Refers to a mechanical part that can be moved easily and without getting stuck.
Nachdem er das Schloss geölt hatte, war der Schlüssel wieder gängig.
After he had oiled the lock, the key was movable again.
The adjective 'gängig' (common/movable) is derived from the verb 'gehen' (to go). The basic idea is that something 'goes' well—either because it can be moved easily, or because it is well accepted in society and 'durchgeht' (passes/goes through).
Diese Redewendung ist im Alltag sehr gängig.
This expression is very common in everyday life.
You can recognize the meaning from the noun: If 'gängig' describes an abstract thing such as a method, an opinion, or a practice, it means 'üblich' (usual/common). If it describes a mechanical part such as a lock or a screw, it means 'leicht beweglich' (easy to move).
Das ist die gängige Meinung zu diesem Thema.
That is the common opinion on this topic.
In the meaning 'üblich' (usual/common), 'gängig' is often combined with nouns such as 'Praxis' (practice), 'Meinung' (opinion), 'Verfahren' (procedure), 'Modell' (model), or 'Größe' (size).
Wir verkaufen dieses Produkt in allen gängigen Größen.
We sell this product in all common sizes.
In the mechanical sense, the construction 'etwas gängig machen' (to make something movable again) is very common. It means making sure that something can move easily again, for example with oil or cleaning.
Mit etwas Öl konnte er das rostige Türschloss wieder gängig machen.
With a little oil, he was able to make the rusty door lock movable again.
usual
Üblich and gängig can both describe an accepted practice or designation. Üblich emphasizes that something is expected in a particular context, while gängig focuses more on its practical prevalence and familiarity. Choose üblich for the situation and gängig for a generally known or frequently used form.

Die Anrede mit dem Nachnamen ist in deutschen Formularen eine gängige Form.
Addressing someone by their last name is a common form in German forms.
In diesem Formular ist die Anrede mit dem Nachnamen üblich.
In this form, addressing someone by their last name is usual.