A title of Minalcar as the regent of Gondor (PM/260). This name is a compound of carma “helm” and cundo “guardian”. Elsewhere cundo means “prince” or “lord” (Ety/KUN, PE17/117). This might still apply here, since Minalcar was heir to the throne. Furthermore, the crown of Gondor was originally a helmet (LotR/1043 note #1), so perhaps: Carma-cundo = “Crown Prince”.
Quenya
cundo
guardian
cundo
noun. lord, guardian, lord, guardian, [ᴹQ.] prince
carma-cundo
proper name. Helm-guardian
cundo noun "guardian" (PM:260), "lord" (PE17:117)