so and so, such a one, where the name of the person is known but not used.
Strong's:
δεῖνα
so and so (when the person is not specified) Derivation: probably from the same as G1171 (through the idea of forgetting the name as fearful, i.e. strange);
δεῖνα, ὁ, ἡ, τό (genitive -νος, dative -νι, accusative -να), [in Aq.: Refs Rut.4:1, 1Ki.21:2 (3) (Sm. also), 4Ki.6:8 * ;] such an one, a certain one, whom one cannot or will not name: Mat.26:18.† (AS)
Thayer:
1) such a one, a certain one, i.e. one whose name I cannot call on the instant, or whose name it is of no importance to mention
δεῖνα
deina
di'-nah
Probably from the same as G1171 (through the idea of forgetting the name as fearful, that is, strange); soandso (when the person is not specified)