When romanizing a personal name abbreviated by more than  one letter, one should include all consonants and vowels of  the
abbreviated name up  to  the last consonant of  the abbreviation.

For example, the abbreviation "alef-lamed" (for "Eli'ezer")   would be romanized as "El."

When the last consonant of the abbreviation is yod, the same principle is followed-- the romanization ends in "y", even if a "y"
would not be used in the full romanization of  the name. So "alef-lamed-yod" is "Eliy" in romanization (for both Eli'ezer and Eliyahu).