Where does “seello” come from?

seello (Old Portuguese) comes from Latin sigillum, from Latin -lus, from Proto-Italic -elos, from Proto-Indo-European -e-lós, from Proto-Indo-European -lós — Forms agent nouns from verbal roots.

Ancestry of “seello”, step by step

Step	Language	Word	Meaning
1	Latin	sigillum	figurine, statuette; seal
2	Latin	-lus	Alternative form of -ulus; diminutive suffix
3	Proto-Italic	-elos	Forms desubstantival and deadjectival diminutive nouns
4	Proto-Indo-European	-e-lós	—
5	Proto-Indo-European	-lós	Forms agent nouns from verbal roots

Words derived from “seello”

selo
selo
selinho

Every word from Proto-Indo-European -lós →Every word from Latin -lus →Every word from Latin sigillum →