* "Diolch" (Welsh) vs. "Dieu" (French): While "diolch" means "thank you" in Welsh, and "dieu" means "God" in French, both are ultimately derived from the same Proto-Indo-European root, "deyw-," meaning "heavenly." They share a similar sound and concept, but have diverged in meaning and usage.
* "Cymru" (Welsh) vs. "Combre" (French): These two words share some phonetic similarities, but their meanings are completely different. "Cymru" is the Welsh name for Wales, while "combre" means "a fellow or companion" in French.
It's important to note that these are just examples, and the linguistic relationship between Welsh and French is complex. There may be other instances of shared vocabulary, but they would likely be due to borrowing from other languages, rather than a direct common ancestor.
If you are looking for words that sound similar or have a similar meaning, you may have better luck with languages that are more closely related to Welsh, such as Irish, Breton, or Cornish.