Formal:
* Son père s'appelle... (Her father is called...)
* Le père de [her name] s'appelle... (The father of [her name] is called...)
Informal:
* Son papa s'appelle... (Her dad is called...)
* Le papa de [her name] s'appelle... (The dad of [her name] is called...)
More specific:
* Elle a un papa qui s'appelle... (She has a dad called...)
* Son père, il s'appelle... (Her father, he is called...)
You can also use "Il s'appelle..." (He is called...) if the context makes it clear who you are talking about.
Example:
* Son père s'appelle Jean. (Her father is called Jean.)
* Le papa de Marie s'appelle Pierre. (Marie's dad is called Pierre.)
* Elle a un papa qui s'appelle Paul. (She has a dad called Paul.)
* Son père, il s'appelle Thomas. (Her father, he is called Thomas.)
The choice of wording depends on the specific situation and your desired level of formality.