I am writing a kesuvah on klaf for a friend of mine who is getting married on Tu B’Av. Should I write the month as Menachem Av or simply Av?
Although some write Menachem Av for the Kesubah, the common custom is to write the kesubah in the same manner as the get, in which only the name Av is written.
See Get Pashut 126:35; concerning the custom of the kesubah, see Kav Ve-Naki on Seder Ha-Get 28b (no. 14). The Chabad custom is to write Menachem Av for the kesubah.