Like how 一(いち) in many cases like 一緒 becomes いっ, and 日（にち）turns in to にっ in words like 日本（にっぽん）, 日光, 日記? Does it have a name or is it part of gemination? Are there any other examples of ちbecoming っ?
I don’t know if there’s a name, but it is mainly for the pronounciation to be easier. You can notice than つ can also become っ. For example in 生年月日 (せいねんがっぴ the date of birth) 月’s reading used is がつ, but to ease the pronounciation it has become がっ
Not ruel I can fined but, I have noticed it tends to be when followed by the た/か group. Same applies to つ。
I cannot speak for all words, but at least in counters:
ち becomes っ in front of か, さ, た, は, ぱ groups,
いち＋とう＝いっとう
はち＋ひき＝はっぴき
and く becomes っ in front of か, は, ぱ groups.
ろく＋か＝ろっか
ひゃく＋ページ＝ひゃっページ
Spoken language predates written language, and a decent general rule for this stuff is “whichever way is easier to say / requires you to move your mouth less”. There are no patterns that are reliable enough to be worth learning imo, you just get a feel for it with time.
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I don’t know if there’s a name, but it is mainly for the pronounciation to be easier. You can notice than つ can also become っ. For example in 生年月日 (せいねんがっぴ the date of birth) 月’s reading used is がつ, but to ease the pronounciation it has become がっ
Not ruel I can fined but, I have noticed it tends to be when followed by the た/か group. Same applies to つ。
I cannot speak for all words, but at least in counters:
ち becomes っ in front of か, さ, た, は, ぱ groups,
いち＋とう＝いっとう
はち＋ひき＝はっぴき
and く becomes っ in front of か, は, ぱ groups.
ろく＋か＝ろっか
ひゃく＋ページ＝ひゃっページ
Spoken language predates written language, and a decent general rule for this stuff is “whichever way is easier to say / requires you to move your mouth less”. There are no patterns that are reliable enough to be worth learning imo, you just get a feel for it with time.
I don’t know about a specific name, but there’s a little bit of info over at wikipedia (it specifically mentions 一緒): https://en.wikipedia.org/wiki/Japanese_phonology#Sound_change
(look under sound change > gemination)