Proto-Austronesian *sikux

→ Aklanon siko (inherited)

→ Bikol Central siko (inherited)

→ Asi siko (inherited)

→ Cebuano siko (inherited)

→ Kagayanen siko (inherited)

→ Northern Catanduanes Bicolano siko (inherited)

→ Cuyunon siko (inherited)

→ Hiligaynon siko (inherited)

→ Ibaloi siko (inherited)

→ Ilocano siko (inherited)

→ Malay siku (inherited)

→ Mansaka siko (inherited)

→ Tagalog siko (inherited)

→ Urak Lawoi' ซีกู (inherited)

→ Waray-Waray siko (inherited)