The Welsh word for heart is
calon

Translations for heart and their definitions

calon	©
1. n-f. (anatomy) heart
2. n-f.          core (of apple, cabbage, etc.)
3. n-f.          center, inner or hidden part
4. n-f. (figuratively) seat of feeling, affection, will, and intellect; one's inmost being, the soul, the spirit; true emotion, mind, thought, intent, secret, etc.
5. n-f.          courage, spirit, manliness, confidence
6. n-f.          heart or fertility (of land)

Pronunciation