Intermary or Intermarry: How To spell?
The word Intermary is misspelled against Intermarry, a verb meaning "To become connected by marriage between their members; to give and take mutually in marriage; -- said of families, ranks, castes, etc."
Intermarry has double "rr" is mispronounced as "r"Remember double 'RR' in between the strings interma & y which should not be misspelled with single 'R'
Wrong Spelling:  interma-r-y  Correct Spelling:  interma-rr-y 
Explore spell check of Intermarry to spell without errors.