Translating to Japanese

Hi guys! Could someone help to translate "Steep Mountain" or "High Mountain" or "Arduous Mountain" or "Leather Mountain" in Japanese? Am trying to think of a business name in Japanese! Thanks in advance :)

1/
Literal translations in an easy and ordinary Japanese are:
"Steep Mountain"　急な山（きゅうなやま）
"High Mountain" 　高い山（たかいやま）
"Arduous Mountain"　厳しい山（きびしいやま）

[I am sorry I can’t understand what kind of mountain this is:
"Leather Mountain”（皮の山）]
Is it some vulgar or slang word?

2/
Similar expressions as above are possible in an easy Japanese like:
険しい山（けわしいやま）　
*険しき山（けわしきやま）
厳しい山（きびしいやま）
*厳し山（きびしきやま）
厳しい峰（きびしいみね）
*厳しき峰（きびしきみね）etc.
[Those with * are somehow classical, so sound a little high-toned.]

3/
But, all Japanese expressions above seem too plain to be used as a business name, though I don’t know what kind of business you are trying to set up.
So, if you hope, you could use combined kanji nouns which already exist like:
峻岳（しゅんがく）
険山（けんざん）
峻嶺（しゅんれい）
峻峰（しゅんぽう）
or, you can use these nouns:
峻険（しゅんけん）
険峻（けんしゅん）
嶮岨（けんそ）
and add 嶺（れい）or 峰（ほう、ぽう）or 山（さん）to one of these nouns.
険峻嶺（けんしゅんれい）for example sounds good...
All above sound high-toned.


Anyway, your question is too vague to answer suitably to your need.