[1] Dahl, which means valley in the North Germanic languages (tal in German, dale in northern England English), is common in Germany, Norway, Denmark, Sweden and the Faroe Islands.
In the Netherlands, a suburb of the city of Nijmegen (which in turn is named after an old estate in the area[2]) is called "Heyerdaal" (also spelled as "Heijerdaal"), in which "daal" also means "valley".
Other examples are "Bloemendaal," "Rozendaal," and "Roosendaal."
There are several variations as it was common to add a suffix to Dahl in order to denote the name bearer's original locale or occupation.
You also find several variations of -dahl used with prefixes (Heyerdahl, Heimendahl...).