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Can I put domain name in [Peer]->Endpoint in wg.conf? 

# eva_xiaomi_notebook client
[Interface]
PrivateKey = 888888888888888888888888888888888
Address = 10.0.0.3/24
DNS = 1.1.1.1

[Peer]
PublicKey = ddddddddddddddddddddddddddddddddddddddddddddddd
Endpoint = 188.225.25.237:51820
AllowedIPs = 0.0.0.0/0, ::/0
PersistentKeepalive = 0

For example if I host a wg server on home nas with dynamic ip, I sure can create DynDNS(duckDNS)

But can I use this domain name as Endpoint?

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I do.

I also use the same pubkey.

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Yes, you can replace the IP address with a FQDN

Note if the IP of that FQDN changes you will have to turn the tunnel off and reactivate it as once the domain name is resolved by wireguard it will not be resolved and since wire guard has no concept of a actual connection It will simply stop working if the IP for that name changes while you're in the middle of using it until you restart the tunnel.

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There is a script for doing this in a way that doesn't tear down the tunnel.
https://github.com/WireGuard/wireguard-tools/blob/master/contrib/reresolve-dns/reresolve-dns.sh

You can make runtime changes to wireguard... so you can leave the tunnel up and just change the endpoint.

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