bp_xprofile_fullname_field_name()

function bp_xprofile_fullname_field_name() {
	$field_name = BP_XPROFILE_FULLNAME_FIELD_NAME;

	/**
	 * Get the nickname field if is set
	 *
	 * @since BuddyBoss 1.0.0
	 */
	if ( $nickname_field_id = bp_xprofile_nickname_field_id( true) ) {
		$field_name = xprofile_get_field( $nickname_field_id )->name;
	}

	/**
	 * Filters the field name for the Full Name xprofile field.
	 *
	 * @since BuddyPress 1.5.0
	 *
	 * @param string $value BP_XPROFILE_FULLNAME_FIELD_NAME Full name field constant.
	 */
	return apply_filters( 'bp_xprofile_fullname_field_name', $field_name );
}