Merruthj was a month of the calendar year of the Klingon civilization.

In the Year of Kahless 844 (Federation calendar 2218), Moj'ih gave birth to The Albino late in the month of Merruthj. (ST novel: Excelsior: Forged in Fire)

Months of the Year
Earth months (Gregorian calendar)	January • February • March • April • May • June • July • August • September • October • November • December
Qo'noS months	Doqath • Lo'Bral • Maktag • Merruthj • nay'Poq • Soo'jen • Xan'lahr
Vulcan/Romulan months	Tasmeen • Haraveen • Sharveen • K'ri'Brax • re'Ti'Khutai
Ferenginar months	Glorpober