Where does “ijiko” come from?

ijiko (Ladino) comes from Ladino -iko, from Latin -icus, from Proto-Italic *-ikos — forms adjectives with the sense of 'of or pertaining to'.

ijiko (Ladino): son

Definitions

Step	Language	Word	Meaning
1	Ladino	-iko	substituted for "o" at the end of masculine words...
2	Latin	-icus	belonging to; derived from; of or pertaining to;...
3	Proto-Italic	*-ikos	forms adjectives with the sense of 'of or pertaining to'