Orcrist is Sindarin for "goblin-cleaver". In the Etymologies, the name Orchrist is said to be a "sword-name", related to Noldorin risto ("rend, rip"), derived from the root RIS ("slash, rip").
Sindarin
orcrist
proper name. Orc-cleaver
Elements
Word Gloss orch “Orc, Orc, [N.] goblin” crist “cleaver, cleaver; [N.] sword; [G.] knife; slash, slice”
Orcrist
Orcrist
Thorin’s sword (LotR/280), a compound of orch “Orc” and crist “cleaver”.
Conceptual Development: This name appeared in The Etymologies from the 1930s as N. Orchrist (Ety/RIS¹).