The title is pretty catchy on its own, but I'm already familiar with creating
good Japanese names. I know about kanji and their meanings, but I'm at a loss.
doubts about a few things. first of them: Can Kun'yomi and On'yomi mix? and
On'yomi can be "chosen" (assuming the kanji name has multiple readings and a
very distant one is "Tai" could I use Tai anyway?) the second is about naming
something that already exists, for example the word Tsumetai. I would love to
know if this could become a name, well these are my doubts (I have terrible
English and bad writing so I apologize for any spelling mistakes or bad
explanations.)
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words usage kanji names
I want to learn a lot about Japanese names for my stories
> Can Kun'yomi and On'yomi mix?

Yes, there are such words.

For 2-kanji words, there are terms
[重{じゅう}箱{ばこ}読{よ}み](https://en.wiktionary.org/wiki/%E9%87%8D%E7%AE%B1%E8%AA%AD%E3%81%BF)
(on'yomi + kun'yomi) and
[湯{ゆ}桶{とう}読み{よみ}](https://en.wiktionary.org/wiki/%E6%B9%AF%E6%A1%B6%E8%AA%AD%E3%81%BF)
(kun'yomi + on'yomi).

[Wiktionary:
Category:Japanese_terms_read_with_jūbakoyomi](https://en.wiktionary.org/wiki/Category:Japanese_terms_read_with_j%C5%ABbakoyomi)

[Wiktionary:
Category:Japanese_terms_read_with_yutōyomi](https://en.wiktionary.org/wiki/Category:Japanese_terms_read_with_yut%C5%8Dyomi)

> On'yomi can be "chosen" (assuming the kanji has multiple readings and a very
> distant one is "Tai" could I use Tai anyway?)

For newly invented names, yes.

Kanji also have [nanori (名{な}乗{の}り)](https://en.wikipedia.org/wiki/Nanori)
readings, which are used only in proper names.

> the second is about naming something that already exists, for example the
> word Tsumetai. I would love to know if this could become a name

I think that names derived from adjectives more likely use Middle/Classical
Japanese form of Terminal/Conclusive, which had suffix 〜し. E.g. modern 広{ひろ}い
had Middle/Classical Japanese Terminal/Conclusive 広{ひろ}し. Kanji used for
spelling names are often different from kanji used for common noun, from which
these names originate.

Some examples:

[よし](https://en.wiktionary.org/wiki/%E3%82%88%E3%81%97) (modern adjective
良{よ}い/善{よ}い/... and 良{い}い/善{い}い/...)

[あつし](https://en.wiktionary.org/wiki/%E3%81%82%E3%81%A4%E3%81%97) (modern
adjective 厚{あつ}い/篤{あつ}い)

[きよし](https://en.wiktionary.org/wiki/%E3%81%8D%E3%82%88%E3%81%97) (modern
adjective 清{きよ}い)

[ひろし](https://en.wiktionary.org/wiki/%E3%81%B2%E3%82%8D%E3%81%97) (modern
adjective 広{ひろ}い)

So in your example, I would suggest つめたし for name instead of つめたい.

Some names are derived from verbs, either Terminal/Conclusive or Continuative,
also often from Middle/Classical Japanese form (which differed from modern
form only for some verbs). Examples:

[さとる](https://en.wiktionary.org/wiki/%E3%81%95%E3%81%A8%E3%82%8B) (verb 悟{さと}る
"to perceive, to understand, to come to enlightenment")

[ひろむ](https://en.wiktionary.org/wiki/%E3%81%B2%E3%82%8D%E3%82%80) (modern verb
広{ひろ}める/弘{ひろ}める/拡{ひろ}める "to broaden, to widen" ← Middle Japanese verb
広{ひろ}む/弘{ひろ}む/拡{ひろ}む)

[めぐみ](https://en.wiktionary.org/wiki/%E3%82%81%E3%81%90%E3%81%BF) (verb 恵{めぐ}む
"to bless")

[こおり](https://en.wiktionary.org/wiki/%E3%81%93%E3%81%8A%E3%82%8A) (verb 凍{こお}る
"to freeze")
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answer