Alteño Surnames

Is anyone familiar with these surnames?

DE LA PEDROSA
DíAZ-CASTELLANO
ÁLVAREZ DE LA CRUZ
LOMELíN

i HAVE 3 ÁLVAREZ DE LA CRUZ AND ABOUT 4 DE LA CRUZ
MY RESEARCH IS LEADING ME TO THE CONCLUSION THAT
THESE TWO FAMILIES ARE RELATED. SOME JUST ÁLVAREZ
OR CRUZ. DíAZ-CASTELLANO IS THE INTERESTING ONE I HAD NEVER
SEEN IT BEFORE. ANY HELP OR COMMENTS? GRACIAS! -dANIEL MDC