public function givenAlpha(string $surn, string $salpha, bool $marnm, bool $fams, string $locale, string $collation): array
    {
        $alphas = [];

        $query = DB::table('name')
            ->where('n_file', '=', $this->tree->id());

        $this->whereFamily($fams, $query);
        $this->whereMarriedName($marnm, $query);

        if ($surn !== '') {
            $n_surn = $this->fieldWithCollation('n_surn', $collation);
            $query->where($n_surn, '=', $surn);
        } elseif ($salpha === ',') {
            $query->where('n_surn', '=', '');
        } elseif ($salpha === '@') {
            $query->where('n_surn', '=', '@N.N.');
        } elseif ($salpha !== '') {
            $this->whereInitial($query, 'n_surn', $salpha, $locale, $collation);
        } else {
            // All surnames
            $query->whereNotIn('n_surn', ['', '@N.N.']);
        }

        // Fetch all the letters in our alphabet, whether or not there
        // are any names beginning with that letter. It looks better to
        // show the full alphabet, rather than omitting rare letters such as X
        foreach ($this->localization_service->alphabet() as $letter) {
            $query2 = clone $query;

            $this->whereInitial($query2, 'n_givn', $letter, $locale, $collation);

            $alphas[$letter] = (int) $query2->distinct()->count('n_id');
        }

        $rows = $query
            ->select([DB::raw('UPPER(SUBSTR(n_givn, 1, 1)) AS initial'), DB::raw('COUNT(*) AS count')])
            ->groupBy('initial')
            ->orderBy(DB::raw("CASE initial WHEN '' THEN 1 ELSE 0 END"))
            ->orderBy(DB::raw("CASE initial WHEN '@' THEN 1 ELSE 0 END"))
            ->orderBy('initial')
            ->pluck('count', 'initial');

        foreach ($rows as $alpha => $count) {
            $alphas[$alpha] = (int) $count;
        }

        return $alphas;
    }