From Tolkien Gateway

The name is always spelt "Hillmen" in the text of LoTR, the form "Hill-men" with hyphen appears only once in Appendix A. --Tik 06:36, 10 November 2020 (UTC)

Sorry, could you please rephrase that?--Tengwar 14:17, 10 November 2020 (UTC)
Good catch, Tik. It should then be moved to the approriate name, IMHO.--Morgan 18:57, 10 November 2020 (UTC)
Agreed. Gaetano 16:07, 12 November 2020 (UTC)
I'll do it. --Tik 18:43, 12 November 2020 (UTC)