When Germanic people marry Roman people that's called race mixing yes.
But that shouldn't be confused with NW European Celts, for Celts belong to Southern European group even if they wandered and settled north.
However Celts are near extinct.
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To Nordicist it is most likely a yes
Depends on the context, but generally i would say no.
Nordicism: Yes
Pro-Caucasoid: No
Every day Iberians ( Spaniards)
https://qph.fs.quoracdn.net/main-qim...cac753239.webp
Spaniard look on TA
http://i.dailymail.co.uk/i/pix/2014/...ine_Tate_a.JPG
:rotfl: