ゴ, いつ, いつ.つ, い, さ, さつ, ち, ふ, み, め
JLPT5 G1 S4 F31
The relevant oracle bone form of this character shows two crossing lines between two parallel lines. The meaning *five* may be connected with the idea that, when counting to ten on one hand, a person first counts to five, then crosses back the other way to reach ten.
[Full Kanji Etymology List]