Why does macOS set my DHCP hostname different than my hostname

Given the following: scutil --get ComputerName // Dan's MacBook Pro scutil --get HostName // Dans-Macbook-Pro scutil --get LocalHostName // Dans-Macbook-Pro Why on earth, if I do a sudo tcpdump -c30 -vn -i en0 port 67 or port 68 and toggle WiFi to check DHCP requests, does macOS do:

➜  ~ sudo tcpdump -c30 -vn -i en0 port 67 or port 68
tcpdump: listening on en0, link-type EN10MB (Ethernet), snapshot length 524288 bytes
01:55:46.692745 IP (tos 0x0, ttl 255, id 61100, offset 0, flags [none], proto UDP (17), length 328)
    0.0.0.0.68 > 255.255.255.255.67: BOOTP/DHCP, Request from 3a:35:ca:31:4e:fc, length 300, xid 0x53a1e874, Flags [none]
	  Client-Ethernet-Address 3a:35:ca:31:4e:fc
	  Vendor-rfc1048 Extensions
	    Magic Cookie 0x63825363
	    DHCP-Message (53), length 1: Request
	    Parameter-Request (55), length 13: 
	      Subnet-Mask (1), Classless-Static-Route (121), Default-Gateway (3), Domain-Name-Server (6)
	      Domain-Name (15), Unknown (108), URL (114), Unknown (119)
	      Unknown (162), Unknown (252), LDAP (95), Netbios-Name-Server (44)
	      Netbios-Node (46)
	    MSZ (57), length 2: 1500
	    Client-ID (61), length 7: ether 3a:35:ca:31:4e:fc
	    Requested-IP (50), length 4: 192.168.50.24
	    Lease-Time (51), length 4: 7776000
	    **Hostname (12), length 3: "Mac"** <---- hostname "Mac" here