Where does “Jari-Pekka” come from?

Jari-Pekka (Finnish) comes from Finnish Jari, from Finnish Jalmari, from Finnish Jalmar, from Swedish Hjalmar, from Old Norse Hjalmarr, from Old Norse herr, from Proto-Norse ᚺᚨᚱᛃᚨ, from Proto-Germanic harjaz — army.

Ancestry of “Jari-Pekka”, step by step

Jari-Pekka traces back through two separate lines of ancestry.

via Finnish Jari

StepLanguageWordMeaning
1FinnishJari
2FinnishJalmari
3FinnishJalmar
4SwedishHjalmarrevived in the 19th century
5Old NorseHjalmarr
6Old Norseherrcrowd, great number; host; army, host, troops
7Proto-Norseᚺᚨᚱᛃᚨarmy leader; commander; warrior
8Proto-Germanicharjazarmy; army leader; commander; warrior
9Proto-Indo-Europeankóryoswar; troops; army; war, troops
10Proto-Indo-Europeanḱer-to grow, to make grow, to nourish; to plait,...
11Proto-Indo-Europeankr̥-to turn, to bend
12Proto-Indo-Europeanker-army

via Finnish Pekka

StepLanguageWordMeaning
1FinnishPekkaa Finnish male given name
2LatinPetrusPeter
3Indonesianpenembakshooter
4Indonesiantembakto shoot to fire a shot
5Malaytembakto shoot
6MalaytimbakObsolete form of tembak
7Proto-Malayictimbak
8Proto-Malayo-Polynesianti(m)bak
Every word from Proto-Indo-European ker-Every word from Proto-Indo-European kr̥-Every word from Proto-Indo-European ḱer-