The complete Tagalog question is probably: "Nasaan na si..."
Examples:
Nasaan na si Nena?
Where is Nena now?
Nasaan na si Pedro?
Where is Pedro now?
Where is Nena now?
Nasaan na si Pedro?
Where is Pedro now?
"Asan" is a conversational short form for Nasaan. Si is a word that is put in front of Filipino names. Na sort of means something like "now" or "already."
