In CTL_NET_NAMES, ECMA is added as "emca" which looks like a typo even in French. The value won't be used anywhere though which is likely why it slipped through. It's been there since day one.
Matthew Index: sys/sys/socket.h =================================================================== RCS file: /src/datum/openbsd/cvs/src/sys/sys/socket.h,v retrieving revision 1.99 diff -u -p -r1.99 socket.h --- sys/sys/socket.h 29 Oct 2020 21:15:27 -0000 1.99 +++ sys/sys/socket.h 6 Oct 2021 10:15:51 -0000 @@ -322,7 +322,7 @@ struct sockpeercred { { "chaos", CTLTYPE_NODE }, \ { "xerox_ns", CTLTYPE_NODE }, \ { "iso", CTLTYPE_NODE }, \ - { "emca", CTLTYPE_NODE }, \ + { "ecma", CTLTYPE_NODE }, \ { "datakit", CTLTYPE_NODE }, \ { "ccitt", CTLTYPE_NODE }, \ { "ibm_sna", CTLTYPE_NODE }, \