Yes. It is 'Q', in fact, but it stands for the German word, "Quelle". In English we might say Question. This refers to the Synoptic gospels in the Christian New Testament, meaning that we aren't sure who wrote them, or in what order.
There are no Tagalog word that starts with letter Q. In Filipino alphabet there is no letter Q.
Questions
Harlequin.
quart
Quintessential Quidnunc
qi
quote
queenly
quick
The word could be quietness, quickness, or quirkiness.
Quantum theory
question