The ornamental design for a wall hung bathroomsinksupport, as shown and described.
FIG. 1 is a front perspective view showing my new design with the sink and faucet shown in phantom lines;
FIG. 2 is a side perspective view of FIG. 1 showing my new design;
FIG. 3 is a front elevation view of a mounting frame of the sink support shown in FIG. 1, the broken lines showing of mounting holes and bracket are for illustrative purposes and from no part of the I claimed design.
FIG. 4 is a top view of FIG. 3 showing my new design; and,
FIG. 5 is a bottom view of FIG. 3 showing my new design.