-ean

1.
an element used to form adjectives from nouns ending in -ea:
crustacean.
Origin
< Latin (us) (Greek -eios), -ae(us) (Greek -aios), -e(us) + -an
British Dictionary definitions for -ean

-an

suffix
1.
(forming adjectives and nouns) belonging to or relating to; a person belonging to or coming from: European
2.
(forming adjectives and nouns) typical of or resembling; a person typical of: Elizabethan
3.
(forming adjectives and nouns) adhering to or following; an adherent of: Christian
4.
(forming nouns) a person who specializes or is expert in: dietitian, phonetician
Word Origin
from Latin -ānus, suffix of adjectives

-ean

suffix
1.
a variant of -an Caesarean
Word Origin and History for -ean

variant of -an after names ending in -ea, -es, -eus.