squaddy

The story

1. Proto-Indo-European*kʷetwṓr
2. Proto-Italic*kʷettwōr
3. Latinquattuor
4. Latinquadrus
5. Latinquadrōbf.?
6. Latinquadrus
7. Vulgar Latin*exquadrō
8. Italiansquadraredeverb.
9. Italiansquadra
10. Frenchescouade
11. Englishsquad
12. English todaysquaddy

From squad + -y.