The ornamental design for a ceilingfan, as shown and described.
FIG. 1 is a top perspective view of a ceiling fan, showing our new design;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a bottom view thereof;
FIG. 5 is a front view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a left side view thereof; and,
FIG. 8 is a rear view thereof.
Portions of the ceiling fan shown in broken lines form no part of the claimed design. Portions of the ceiling fan blades shown in jagged break lines define a symbolic break in the ceiling fan blades and form no part of the claimed design.