Colomb rhymes with:
collom, collum, column, mccollam, mccollom, arunachalam, collom, collum, column, gollum, golomb, mahlum, mccollam, mccollom, slalom, solemn, wollam
Colomb sounds like:
clamp, cleanup, climb, clump, clumpy, collomb, colombe, colombia, colombo, columba, columbia, columbo, coulombe, culinova