That's very lovely Kenny. From what I can see you are not able to give someone credits but you can purchase a gift card for them through your italki account.

https://support.italki.com/hc/en-us/articles/206352558-Can-I-get-a-refund-of-my-purchase- Here is what they say about that: Need help? If you need to transfer your credits to a different account, if you have any payment problems, or if you need support for a special situation, please contact italki support, and we will help you as quickly as we can.