Dear Casper, Can you give us a time frame to work from? It will give us an idea of which resources will be most suitable to help you.
........................Hang on... found this on the Free BMD:
Surname First name(s) District Vol Page
Marriages Mar 1890
Kalies Sophia Merthyr T. 11a 663
THOMAS David Merthyr T 11a 663
The name Kalies is unusual in Glamorgan the name is not listed at all in earlier Glamorgan census returns (1841 / 61) and the name only seems apparant in the Merthyr Tydfil region after 1888, even in 1881 using the national index for the entire U.K, the name only bears one match but to the variation Kales. Perhaps the name has changed or been misspelt in the records (perhaps beginning with a C, instead of a K etc), or the name comes from abroad? The name does seems prevolent in Germany, Prussia regions.
As you may not have used the Free BMD site:
http://freebmd.rootsweb.com/cgi/search.pl , here are all the Kalies (exact name spelling) in Glamorgan ~ you will note they are all in Merthyr.
Surname First name(s) Age District Vol Page
Marriages Jun 1888
Kalies John Merthyr T. 11a 766a
Births Jun 1889
Kalies John Henry Merthyr T. 11a 556
Marriages Mar 1890
Kalies Sophia Merthyr T. 11a 663
Births Sep 1896
Kalies Margaret Mary G Merthyr T. 11a 716
Births Sep 1898
Kalies Thomas Fennimore Merthyr T 11a 683
Births Dec 1899
Kalies David Frederick Merthyr T. 11a 668
Births Sep 1903
Kalies William Joshua Merthyr T. 11a 788
Information on registrars offices can be found here:
http://www.fhsc.org.uk/genuki/reg/gla.htm#mertI hope this has helped you in your search.