Where does “Schild” come from?

Schild (Portuguese) comes from German schild, from Middle High German schilt, from Old High German scilt, from Proto-West Germanic skeldu, from Proto-Germanic skelduz, from Proto-Indo-European (s)keit-.

Ancestry of “Schild”, step by step

Step	Language	Word	Meaning
1	German	schild	sign, plate flat surface bearing information
2	Middle High German	schilt	—
3	Old High German	scilt	—
4	Proto-West Germanic	skeldu	shield
5	Proto-Germanic	skelduz	shield
6	Proto-Indo-European	(s)keit-	—

Every word from Proto-Indo-European (s)keit- →Every word from Proto-Germanic skelduz →Every word from Proto-West Germanic skeldu →