Boy short list

[Starberries]

We have had Noah and Isaiah as 'picked out' names for years. But as both are firmly in the top 100 now (and even higher in the US, where I'm from and where we'll be for a good part of the year) we've been thinking of alternatives.

Can't have any 'H' names as our surname begins with H, which is a huge shame as I love Hugo, Henry, and Harry.

Can I have opinions on the following names please (honest opinions):

Asher
Beckett
Casian/Cassian
Elias
Jasper
Jude
Jonah
Julian
Marlowe
Oren
Rylan
Seren
Theo (possibly Theodore)

Asher - not sure about this
Beckett - no
Casian/Cassian - like a bit
Elias - yes
Jasper - love it
Jude - no
Jonah - no
Julian - actually, yes, might be 'back' again.
Marlowe - no
Oren - no, sounds like a girls name
Rylan - no
Seren - just makes me think of Serena with the 'a' missed off.
Theo (possibly Theodore) - yes.