Well... the title says it all!
Most of the Otsutsuki clan members, if not all to appear in Boruto have "shiki" at the end of their names. Examples would be Momoshiki Otsutsuki, Kinshiki Otsutsuki, Urashiki Otsutsuki (filler), and Isshiki Otsutsuki. There are indeed some Otsutsuki without shiki in their names, such as Ashura, Indra, Kaguya, Hagoromo, Hamura, and more. However it raised my eyebrow when almost all Otsutsuki in Boruto had "shiki" in the end of their name, so I wondered if it has any significance.
So, is there any significance to the "shiki" most Otsutsuki have in their names? If so, what is it?