Assuming that they sent the Meraglim from Rismah, why was it called by that name?
Rashi: It was called by that name based on the Pasuk in Tehilim, 120:3 "descibing the punishment that people who speak Lashon ha'Ra receive "Mah Yiten l'cha u'Mah Yosif lach, Lashon Remiyah? Chitzei Gobor Shenunim im Gachalei Resamim!"
Targum Yonasan: It was called "Rismah" because broom bushes (Rosem trees) grew there. 1
Targum Yonasan translates many of the place names in similar fashion. I do not make a point of citing them because they are not based on a question.