Name popularity varies dramatically by country and by era. Behindthename.com is an interesting source. In the US, It was an unpopular name from 1880 to 1970, then shot to number one and peaked in 1990. It’s still popular but declining a little. Here it is a name of young men.

No. Here in the USA it is a very common name for a male.

It has a biblical heritage. It's also popular for babies right now. https://www.babycenter.com/baby-names-jacob-2196.htm https://www.bbc.co.uk/news/uk-england-45559619

No, especially when it is contracted to "Jake"