Where does “lonbu” come from?

lonbu (Kabuverdianu) comes from Portuguese lombo, from Old Portuguese lombo, from Latin lumbus, from Proto-Italic lonðwos, from Proto-Indo-European lendʰwos, from Proto-Indo-European lendʰ- — land, heath; loins.

lonbu (Kabuverdianu): back

Definitions

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Ancestry of “lonbu”, step by step

Step	Language	Word	Meaning
1	Portuguese	lombo	back; loin
2	Old Portuguese	lombo	—
3	Latin	lumbus	loin; lumbar; genitals
4	Proto-Italic	lonðwos	—
5	Proto-Indo-European	lendʰwos	—
6	Proto-Indo-European	lendʰ-	land, heath; loins

Every word from Proto-Indo-European lendʰ- →Every word from Proto-Indo-European lendʰwos →Every word from Proto-Italic lonðwos →