from JPuranen:”The first surname law was enacted in Finland in 1920. It stipulated that the surname was mandatory, although the use of the surname had already become common in the late 19th century.
After 1920, the surname is fixed. Changing it is difficult.
Before 1920 it was easier. Many soldiers started using a military name as their last name.
Many professionals also chose a Swedish surname for themselves.”
............................................................
He later used surname:Kaukometsä. Earlier name had been Pyy.
“Sukunimi Okker muutettu maaherran päätöksellä 4.12.1936 sukunimeksi KAUKOMETSÄ.“ When did children adopt the Kaukometsä name? Or did they? if the change was made in 1936
1880-1890 LK kuva 103 “Nikodemus Pyyn (No 134) laps. vaimosta Eve Stina Johsdr, f. 1837” “80 t s. 109”
1880-1890 LK p 162 Pyyrinlahti 4 Pentillä “Pyytär” “Torp.”
Konginkangas 1890-1899 RK p 201 Pyyrinlahti 2 Autio “Torp”
Konginkangas 1890-1899 RK p 200 Pyyrinlahti 2 Autio “vävy” “94 siv 201,, ub 176” “vih 30/12 94”

Konginkangas 1900-1909 RK p 227 Pyyrinlahti 2 Mäenpää “Mkt.” ”1904 fr 216” “Uks. 440”
Konginkangas 1900-1909 RK p 201 Pyyrinlahti 2 Kautto Pikkula “mäkitp. Okker” “216-1907”

the records for her and her parents (no birthplaces were previously known) were provided by the paid parish researcher of Äänekoski/Konginkangas on 19 Sep 1997 referencing:
nro 73/1880
sivu 179/1884: Pyrinlahti, Liimattalan kinkeri
nro. 6. Listo, torppa Murtolahti

Konginkangas 1890-1899 RK p 201 Pyyrinlahti 2 Autio “vmo, 9/4 1863” k 13/5 94 (of tarvastus xxxx) (verified: 30years, 2 months, 4 days))

verify her birthdate on Sumiainen roll 67547 as well as birth of Maria Okker..I could not find this in the birth records in the years 1860-66 in the Sumianen roll 67547 and in the LK. for 1851-66 there were NO Kumpulains at all.

there are many Kumpulains in Viitasaari

she was not born in Saarijärvi

Her birth record is not found in Sumiainen 1n 1863, but her parents are recorded as going to Sumais in 1863

1860-1873 LK p 592 Pyrinlax 6 Listo “9/8 1863”
1873-1879 LK p 81 Pyyrinlahti 6 Ahola “stdr Johan Johssn Kumpulains bb m hu Eva Mattsdr s. 1826”
1880-1890 LK kuva 98 “rippikirjalle 1889”
Konginkangas 1880-1890 RK p 175 “84 t s. 179”
Konginkangas 1880-1890 RK p 179 Listo 6 “84 t 73” “84 t 121”

1880-1889 RK p 129 Pyyrinlahti 2 Autio “Tytär” “25/7 1872”
Konginkangas 1890-1899 RK p 200 Pyyrinlahti 2 Autio “tytär>vaimo”

Konginkangas 1900-1909 RK p 227 Pyyrinlahti 2 Mäenpää “Mkt.” ”1904 fr 216” “Uks. 440”
Konginkangas 1900-1909 RK p 201 Pyyrinlahti 2 Kautto Pikkula “wmo., 25/7 1872” “216-1907”