Is it deer resistant?

Yes

Three-Lobed-Leaved Ivy Tree is deer resistant.

Dendropanax trifidus

Deer: Rarely
Height: 25 ft (7.6 m)
Spread: 12 ft (3.7 m)
Zones: 7–11
Light: Full sun

Perennial
Shrub
Tree

Three-Lobed-Leaved Ivy Tree (Dendropanax trifidus)

Photo: Alpsdake · CC BY-SA 4.0

Shrub Dendropanax

More details

Light: Full sun, Partial shade, Shade
Type: Perennial, Shrub, Tree
Maintenance: Low
Growth: Slow
Foliage: Evergreen
Features: Drought tolerant, Flowering
Best uses: Accent, Flowering tree, Specimen, Woodland