angegeben
specified
Named, specified, or declared. Refers to information that has been officially communicated or defined.
Bitte überweisen Sie den Betrag auf das angegebene Konto.
Please transfer the amount to the specified account.

specified / boastful
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specified
Named, specified, or declared. Refers to information that has been officially communicated or defined.
Bitte überweisen Sie den Betrag auf das angegebene Konto.
Please transfer the amount to the specified account.

'Angegeben' (specified/boastful) is the past participle of the separable verb 'angeben' (to state/to show off). Here it is used as an adjective. The two different meanings of the adjective come from the different meanings of the verb.
Er hat seine neue Adresse noch nicht angegeben.
He still hasn't provided his new address.
You can recognize the meaning from context. If 'angegeben' (specified/boastful) refers to neutral information (e.g., address, price, appointment), it means 'specified'. If it describes a person or their behavior, it means 'boastful' and is meant negatively.
Die Lieferung erfolgt innerhalb der angegebenen Zeit.
Delivery takes place within the specified time.
In the neutral meaning 'spezifiziert' (specified), 'angegeben' (specified) mainly appears before nouns that refer to information. Typical examples are: 'die angegebene Adresse' (the specified address), 'der angegebene Betrag' (the specified amount), 'der angegebene Termin' (the specified date/appointment), or 'die angegebene Menge' (the specified quantity).
Bitte prüfen Sie die im Vertrag angegebenen Daten sorgfältig.
Please carefully check the data specified in the contract.
The meaning 'prahlerisch' (boastful) is colloquial and always derogatory. The word is used to criticize the behavior of a person who thinks they are better than others or shows off.
Ihre angegebene Art macht sie bei den Kollegen nicht sehr beliebt.
Her boastful manner doesn't make her very popular with her colleagues.
mentioned / called
'genannt' and 'angegeben' can both mean that a piece of information has been named or specified. 'genannt' fits generally when referring to a name, a person, or something previously mentioned. 'angegeben' sounds more precise when it is about data, numbers, addresses, dates, or other official information. Learners may confuse the words because both refer to something that has already been stated. In forms, contracts, or instructions, 'angegeben' is often more natural. With names or people already mentioned, 'genannt' is usually simpler and more neutral.

Der Arzt ruft die angegebene Telefonnummer an.
The doctor calls the specified phone number.
Der genannte Fahrer wartet vor dem Eingang.
The mentioned driver is waiting in front of the entrance.