Gonzalo rhymes with:
zollo, apollo, arebalo, arevalo, calo, carballo, carollo, cefalo, dalo, depalo, dzialo, figallo, follow, garafalo, garofalo, hollow, khumalo, lovallo, mallo, malo, manalo, margalo, metallo, mollo, musalo, pangallo, pollo, rollo, ruffalo, salo, solow, strollo, swallow, vassallo, wallo, wallow, zollo
Gonzalo sounds like:
gangl, ganglia, gangly, ganzel, gensel, giancola, gingell, gonococcal, gunkel