yOUR NAME DERIVES FROM christus LATIN FOR 'CHRIST' AND i DON'T KNOW OF ANY EQUIVALENT IN iRISH

tHERE IS A WEB PAGE BUT i CAN'T REMEMBER IT NOW, WITH IRISH NAMES; YOU MIGHT FIND SOMETHING THERE.

TRY STARTING WITH WWW.HOMESTEADER.COM
or
SEARCH UNDER IRISH GENEALOGY