Where does “aquel” come from?

aquel (Old Portuguese) comes from Vulgar Latin *eccum ille, from Latin eccum, from Latin ecce, from Latin -ce, from Proto-Italic ke, from Indo-European *ḱe.

Ancestry of “aquel”, step by step

Step	Language	Word	Meaning
1	Vulgar Latin	*eccum ille	—
2	Latin	eccum	behold him; here!, look!
3	Latin	ecce	see!, look!, behold!, points out something with...
4	Latin	-ce	affixed, usually to demonstratives, forming...
5	Proto-Italic	ke	here
6	Indo-European	*ḱe	—

Words derived from “aquel”

aquel

Every word from Indo-European *ḱe →Every word from Latin -ce →Every word from Proto-Italic ke →