Actually, was Pellan ever explicitly referred to a male?
Preferably by the skeleton themself?

I mean, there's the "Isn't Pellan a girl's name?" "It's a warrior's name." exchange (Not that those are mutually exclusive), but even that is potentially misleading.
The objection might be well over being called a child (girl instead of woman) instead of the implication that P's female.
Or it is a matter on emphasis. Pellan is a warrior, academy trained and all, not some random traveler who is halfway descent with a blade.