The ornamental design for a nametagholder, as shown and described.
FIG. 1 is a front isometric view of the applicant's nametag holder according to the Design;
FIG. 2 is a rear isometric view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a side view thereof;
FIG. 7 is a front isometric view of the applicant's nametag holder attached to a lanyard clip, the clip being shown as environment and not forming part of the Design; and,
FIG. 8 is a rear isometric view of the applicant's nametag holder attached to a lanyard clip, the clip being shown as environment and not forming part of the Design.
The lanyard clip shown in broken lines in FIGS. 7 and 8 does not form part of the Design, but rather is intended to illustrate the environment of the applicant's nametag holder.