There's a particularly interesting sound change that occurred from Proto-Germanic into Romance languages that crops up a decent amount in English. Where the language originally had a w sound at the start of words, the consonant shifted into the velar stop g, and a u was inserted after it to differentiate it from the "soft" g. English often borrowed these words, while simultaneously keeping the w- words from Germanic, resulting in some cool pairings. Here are some examples of this:
Hello! I'm Adam Aleksic, a sophomore studying linguistics and government at Harvard University, where I founded the Harvard Undergraduate Linguistics Society. I also have disturbing interests in politics, vexillology, geography, board games, conlanging, and law.