cousin-nephew

First cousin's son.

My cousin-nephew is a good boy.

third cousin-uncle

Parent's male third cousin.

My third cousin-uncle is a good person.

co-first-cousin-twice-removed-in-law

Spouse's first-cousin-twice-removed's spouse.

My co-first-cousin-twice-removed-in-law is a good person.

cousin-aunt

Parent's female first cousin.

My cousin-aunt is a good person.

Cousin Stacy

A normal cousin but with a boy's name; like Stacy

My cousin's name is Stacy. Why does your cousin have a boys name? She is a Cousin Stacy

double-first cousin-nephew

Son of their maternal first cousin with the paternal first cousin or double-first cousin’s son.

My double-first cousin-nephew is a good person.

half-cousin

1- Half-pibling's child.
2- Someone who, in relation to others, has zero parents and one grandparent in common.

Half-cousin.