创建一个程序，输入一个名字并返回该名字中所有元音字母的数量。


name = "Jacob"
Here's a Python program to count the number of vowels in a given name:
```python
name = "Jacob"
vowel_count = 0
vowels = ['a', 'e', 'i', 'o', 'u']

for letter in name.lower():
    if letter in vowels:
        vowel_count += 1

print("The name", name, "contains", vowel_count, "vowels.")
```
Output:
```
The name Jacob contains 2 vowels.
```