Where does “null prefix” come from?

null prefix (English) comes from English prefix, from Latin praefixum, from Latin praefixus, from Latin praefigo, from Latin prae-, from Proto-Italic prai-, from Proto-Indo-European preh₂-, from Proto-Indo-European per- — passed , crossed.

Ancestry of “null prefix”, step by step

null prefix traces back through two separate lines of ancestry.

via English prefix

StepLanguageWordMeaning
1EnglishprefixSomething placed before another; To determine...
2Latinpraefixumnominative neuter singular of praefīxus;...
3Latinpraefixusfastened or attached in front; prefixed
4LatinpraefigoI fasten before, attach in front; I point with
5Latinprae-before; in front; in charge
6Proto-Italicprai-pre-, before
7Proto-Indo-Europeanpreh₂-before, in front
8Proto-Indo-Europeanper-before, in front; first; to go through
9Proto-Indo-Europeanpr̥tóspassed , crossed

via English null

StepLanguageWordMeaning
1EnglishnullA non-existent or empty value or set of values;...
2Middle Frenchnulnobody; no one; none
3Old Frenchnulnobody; no one; none
4Latinnūllusno one, none, not any, nothing
5Proto-Italicoinoscardinal number 1 Previous: n/a Next: *duō;...
6Proto-Indo-Europeanóynosone; single
Every word from Proto-Indo-European pr̥tósEvery word from Proto-Indo-European per-Every word from Proto-Indo-European preh₂-